Historically, cavalry (from the French word cavalerie , itself derived from cheval meaning "horse") are groups of soldiers or warriors who fight mounted on horseback . Until the 20th century, cavalry were the most mobile of the combat arms , operating as light cavalry in the roles of reconnaissance , screening , and skirmishing , or as heavy cavalry for decisive economy of force and shock attacks . An individual soldier in the cavalry is known by a number of designations depending on era and tactics, such as a cavalryman , horseman , trooper , cataphract , knight , drabant , hussar , uhlan , mamluk , cuirassier , lancer , dragoon , samurai or horse archer . The designation of cavalry was not usually given to any military forces that used other animals or platforms for mounts, such as chariots , camels or elephants . Infantry who moved on horseback, but dismounted to fight on foot, were known in the early 17th to the early 18th century as dragoons , a class of mounted infantry which in most armies later evolved into standard cavalry while retaining their historic designation.
174-397: Cavalry had the advantage of improved mobility, and a soldier fighting from horseback also had the advantages of greater height, speed, and inertial mass over an opponent on foot. Another element of horse mounted warfare is the psychological impact a mounted soldier can inflict on an opponent. The speed, mobility, and shock value of cavalry was greatly valued and exploited in warfare during
348-702: A breed of large horses was bred in the Nisaean plain in Media to carry men with increasing amounts of armour (Herodotus 7,40 & 9,20), but large horses were still very exceptional at this time. By the fourth century BC the Chinese during the Warring States period (403–221 BC) began to use cavalry against rival states, and by 331 BC when Alexander the Great defeated the Persians
522-402: A displacement R AB , Newton's law of gravitation states that each object exerts a gravitational force on the other, of magnitude where G is the universal gravitational constant . The above statement may be reformulated in the following way: if g is the magnitude at a given location in a gravitational field, then the gravitational force on an object with gravitational mass M is This
696-405: A gravitational field . If a first body of mass m A is placed at a distance r (center of mass to center of mass) from a second body of mass m B , each body is subject to an attractive force F g = Gm A m B / r , where G = 6.67 × 10 N⋅kg ⋅m is the "universal gravitational constant ". This is sometimes referred to as gravitational mass. Repeated experiments since
870-411: A measure of the body's inertia , meaning the resistance to acceleration (change of velocity ) when a net force is applied. The object's mass also determines the strength of its gravitational attraction to other bodies. The SI base unit of mass is the kilogram (kg). In physics , mass is not the same as weight , even though mass is often determined by measuring the object's weight using
1044-553: A retronym to differentiate older full-powered rifles of these configurations like the M1 Garand , from newer assault rifles using intermediate cartridges like the Heckler & Koch HK33 , but it is sometimes used to describe similar modern rifles such as the FN SCAR . Battle rifles serve similar purposes as assault rifles, as they both are usually employed by ground infantry for essentially
1218-445: A riot gun or breaching rounds to function as a door breaching shotgun. Shotgun munitions, regardless of type, are packed into shotgun shells (cartridges designed specifically for shotguns) that are loaded into the shotgun for use; these shells are commonly loose and manually loaded one-by-one, though some shotguns accept magazines. Shotguns share many qualities with rifles, such as both being descendants of early long guns such as
1392-518: A spring scale , rather than balance scale comparing it directly with known masses. An object on the Moon would weigh less than it does on Earth because of the lower gravity, but it would still have the same mass. This is because weight is a force, while mass is the property that (along with gravity) determines the strength of this force. In the Standard Model of physics, the mass of elementary particles
1566-663: A broad class of rifles generally summed up as short, lightweight, portable sniper rifles; and designated marksman rifles , semi-automatic high-precision rifles, usually chambered in intermediate or full-power cartridges, that fill the range gap between sniper rifles and regular rifles and are designed for designated marksmen in squads. Examples of sniper and scout rifles include the M40 rifle , Heckler & Koch PSG1 , Walther WA 2000 , Accuracy International AWM , M24 Sniper Weapon System , Steyr Scout , Sako TRG , and CheyTac Intervention . Examples of anti-materiel and anti-tank rifles include
1740-406: A bronze ball and a wooden ramp. The wooden ramp was "12 cubits long, half a cubit wide and three finger-breadths thick" with a straight, smooth, polished groove . The groove was lined with " parchment , also smooth and polished as possible". And into this groove was placed "a hard, smooth and very round bronze ball". The ramp was inclined at various angles to slow the acceleration enough so that
1914-530: A curved path. "For a stone projected is by the pressure of its own weight forced out of the rectilinear path, which by the projection alone it should have pursued, and made to describe a curve line in the air; and through that crooked way is at last brought down to the ground. And the greater the velocity is with which it is projected, the farther it goes before it falls to the Earth." Newton further reasons that if an object were "projected in an horizontal direction from
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#17330859413942088-609: A fearsome heavy cavalry force. King Gwanggaeto the Great often led expeditions into the Baekje , Gaya confederacy , Buyeo , Later Yan and against Japanese invaders with his cavalry. In the 12th century, Jurchen tribes began to violate the Goryeo–Jurchen borders, and eventually invaded Goryeo Korea. After experiencing invasion by the Jurchen, Korean general Yun Kwan realized that Goryeo lacked efficient cavalry units. He reorganized
2262-505: A force from a scale or the surface of a planetary body such as the Earth or the Moon . This force keeps the object from going into free fall. Weight is the opposing force in such circumstances and is thus determined by the acceleration of free fall. On the surface of the Earth, for example, an object with a mass of 50 kilograms weighs 491 newtons, which means that 491 newtons is being applied to keep
2436-575: A formidable composite army made up of the cavalry forces of the Shakas, Yavanas, Kambojas, Kiratas, Parasikas and Bahlikas as attested by Mudra-Rakashas (Mudra-Rakshasa 2). These hordes had helped Chandragupta Maurya defeat the ruler of Magadha and placed Chandragupta on the throne, thus laying the foundations of Mauryan dynasty in Northern India. The cavalry of Hunas and the Kambojas is also attested in
2610-399: A friend, Edmond Halley , that he had solved the problem of gravitational orbits, but had misplaced the solution in his office. After being encouraged by Halley, Newton decided to develop his ideas about gravity and publish all of his findings. In November 1684, Isaac Newton sent a document to Edmund Halley, now lost but presumed to have been titled De motu corporum in gyrum (Latin for "On
2784-423: A full-power caliber and a certain weight that can be operated by an individual but tend to work best with a crew; and heavy machine guns , machine guns that are too large and heavy to be carried and are thus mounted to something (like a tripod or military vehicle ), and require a crew to operate. A general-purpose machine gun combines these categories under a single flexible machine gun platform, often one that
2958-625: A full-size rifle with a shortened carbine-style barrel for close-quarters use. The small size of a carbine provides lighter weight and better maneuverability, making them ideal for close-quarters combat and storage in compact areas. This makes them popular firearms among special forces and police tactical units alongside submachine guns , considerably so since the late 1990s due to the familiarity and better stopping power of carbines compared to submachine guns. They are also popular with (and were originally mostly intended for) military personnel in roles that are expected to engage in combat, but where
3132-452: A full-size rifle would be an impediment to the primary duties of that soldier ( logistical personnel, airborne forces , military engineers , officers , etc.), though since the turn of the millennium these have been superseded to a degree in some roles by personal defense weapons . Carbines are also common among civilian firearm owners who have size, space, and power concerns similar to military and police users. Examples of carbines include
3306-421: A gravitational field. Newton further assumed that the strength of each object's gravitational field would decrease according to the square of the distance to that object. If a large collection of small objects were formed into a giant spherical body such as the Earth or Sun, Newton calculated the collection would create a gravitational field proportional to the total mass of the body, and inversely proportional to
3480-406: A hammer and a feather are dropped from the same height through the air on Earth, the feather will take much longer to reach the ground; the feather is not really in free -fall because the force of air resistance upwards against the feather is comparable to the downward force of gravity. On the other hand, if the experiment is performed in a vacuum , in which there is no air resistance, the hammer and
3654-452: A long tradition of intense military exchange between Han Chinese infantry forces of the settled dynastic empires and the mounted nomads or "barbarians" of the north. The naval history of China was centered more to the south, where mountains, rivers, and large lakes necessitated the employment of a large and well-kept navy . In 307 BC, King Wuling of Zhao , the ruler of the former state of Jin , ordered his commanders and troops to adopt
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#17330859413943828-486: A member of a social and martial elite, able to meet the considerable expenses required by his role from grants of land and other incomes. Xiongnu , Tujue , Avars , Kipchaks , Khitans , Mongols , Don Cossacks and the various Turkic peoples are also examples of the horse-mounted groups that managed to gain substantial successes in military conflicts with settled agrarian and urban societies, due to their strategic and tactical mobility. As European states began to assume
4002-793: A method of effective self-defense against skirmishers and infiltrators who cannot effectively be defeated by low-powered submachine guns and handguns, often the only firearms suitable for those personnel (while they could be issued rifles or carbines, those would become unnecessary burdens in their normal duties, during which the likelihood of hostility is fairly rare regardless, making their issuance questionable). Thus, per their name, personal defense weapons allow these personnel to effectively defend themselves from enemies and repel attacks themselves or at least until support can arrive. They are not intended for civilian self-defense due to their nature as automatic firearms (which are usually prohibited from civilian purchase), though some semi-automatic PDWs exist for
4176-416: A shock weapon in the siege of De'an in 1132. In the 13th century, fire lance barrels were replaced with metal tubes and transformed into the metal-barreled hand cannon . The technology gradually spread throughout Eurasia during the 14th century. Older firearms typically used black powder as a propellant , but modern firearms use smokeless powder or other explosive propellants. Most modern firearms (with
4350-469: A single soldier, though some are crew-served weapons that require a dedicated crew of soldiers to operate, usually between two and six soldiers depending on the machine gun's operation and the crew members' roles (ammunition bearers, spotters, etc.). Machine guns can be divided into three categories: light machine guns , individual-served machine guns of an intermediate cartridge that are usually magazine-fed; medium machine guns , belt-fed machine guns of
4524-463: A string, does the combined system fall faster because it is now more massive, or does the lighter body in its slower fall hold back the heavier body? The only convincing resolution to this question is that all bodies must fall at the same rate. A later experiment was described in Galileo's Two New Sciences published in 1638. One of Galileo's fictional characters, Salviati, describes an experiment using
4698-410: A time by the user, rather than automatically. Manual action firearms can be divided into two basic categories: single-shot firearms that can only be fired once per barrel before it must be reloaded or charged via an external mechanism or series of steps; and repeating firearms that can be fired multiple times per barrel, but can only be fired once with each subsequent pull of the trigger or ignite, and
4872-410: A uniform acceleration and a uniform gravitational field. Thus, the theory postulates that the force acting on a massive object caused by a gravitational field is a result of the object's tendency to move in a straight line (in other words its inertia) and should therefore be a function of its inertial mass and the strength of the gravitational field. In theoretical physics , a mass generation mechanism
5046-455: A vacuum, as David Scott did on the surface of the Moon during Apollo 15 . A stronger version of the equivalence principle, known as the Einstein equivalence principle or the strong equivalence principle , lies at the heart of the general theory of relativity . Einstein's equivalence principle states that within sufficiently small regions of spacetime, it is impossible to distinguish between
5220-463: Is Yabusame (流鏑馬), a type of mounted archery in traditional Japanese archery. An archer on a running horse shoots three special "turnip-headed" arrows successively at three wooden targets. This style of archery has its origins at the beginning of the Kamakura period. Minamoto no Yoritomo became alarmed at the lack of archery skills his samurai had. He organized yabusame as a form of practice. Currently,
5394-485: Is a balance scale , which balances the force of one object's weight against the force of another object's weight. The two sides of a balance scale are close enough that the objects experience similar gravitational fields. Hence, if they have similar masses then their weights will also be similar. This allows the scale, by comparing weights, to also compare masses. Consequently, historical weight standards were often defined in terms of amounts. The Romans, for example, used
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5568-551: Is a long gun that has a predominantly smoothbore barrel—meaning it lacks rifling—designed to fire a number of shot pellets in each discharge. These shot pellet sizes commonly range between 2 mm #9 birdshot and 8.4 mm #00 (double-aught) buckshot, and produce a cluster of impact points with considerably less range and accuracy, since shot spreads during flight. Shotguns are also capable of firing single solid projectiles called slugs , or specialty (often " less lethal ") munitions such as bean bags or tear gas to function as
5742-616: Is a magazine-fed carbine chambered in a small-caliber handgun cartridge (such as 9×19mm Parabellum , .45 ACP , .22 Long Rifle , and .40 S&W ). They cannot be considered machine guns due to their small-caliber, hence the prefix " sub- " to differentiate them from proper machine guns. Submachine guns are commonly associated with high rates of fire, automatic fire capabilities, and low recoil, though many submachine guns differentiate from this in various ways, such as having fairly low rates of fire or including burst and semi-automatic modes available through selective fire. Most submachine guns are
5916-450: Is a theory which attempts to explain the origin of mass from the most fundamental laws of physics . To date, a number of different models have been proposed which advocate different views of the origin of mass. The problem is complicated by the fact that the notion of mass is strongly related to the gravitational interaction but a theory of the latter has not been yet reconciled with the currently popular model of particle physics , known as
6090-419: Is adequate for most of classical mechanics, and sometimes remains in use in basic education, if the priority is to teach the difference between mass from weight.) This traditional "amount of matter" belief was contradicted by the fact that different atoms (and, later, different elementary particles) can have different masses, and was further contradicted by Einstein's theory of relativity (1905), which showed that
6264-483: Is an intrinsic property of a body . It was traditionally believed to be related to the quantity of matter in a body, until the discovery of the atom and particle physics . It was found that different atoms and different elementary particles , theoretically with the same amount of matter, have nonetheless different masses. Mass in modern physics has multiple definitions which are conceptually distinct, but physically equivalent. Mass can be experimentally defined as
6438-417: Is any firearm with a notably long barrel, typically a length of 10 to 30 inches (250 to 760 mm) (there are restrictions on minimum barrel length in many jurisdictions; maximum barrel length is usually a matter of practicality). Unlike a handgun, long guns are designed to be held and fired with both hands, while braced against either the hip or the shoulder for better stability. The receiver and trigger group
6612-557: Is believed to be a result of their coupling with the Higgs boson in what is known as the Brout–Englert–Higgs mechanism . There are several distinct phenomena that can be used to measure mass. Although some theorists have speculated that some of these phenomena could be independent of each other, current experiments have found no difference in results regardless of how it is measured: The mass of an object determines its acceleration in
6786-404: Is designed to be readily carried and operated by an individual. The term is legally defined further in different countries (see legal definitions ). The first firearms originated in 10th-century China , when bamboo tubes containing gunpowder and pellet projectiles were mounted on spears to make the portable fire lance , operable by a single person, which was later used effectively as
6960-540: Is most suitable as a light or medium machine gun but fares well as a heavy machine gun. A closely related concept is the squad automatic weapon , a portable light machine gun or even a modified rifle that is designed and fielded to provide a squad with rapid direct fire . Examples of machine guns include the Maxim gun , M2 Browning , Bren light machine gun , MG 42 , PK machine gun , FN MAG , M249 light machine gun , RPK , IWI Negev , and M134 Minigun . A submachine gun
7134-467: Is mounted into a stock made of wood, plastic, metal, or composite material, which has sections that form a foregrip, rear grip, and optionally (but typically) a shoulder mount called the butt . Early long arms, from the Renaissance up to the mid-19th century, were generally smoothbore firearms that fired one or more ball shot, called muskets or arquebuses depending on caliber and firing mechanism. Since
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7308-408: Is the acceleration due to Earth's gravitational field , (expressed as the acceleration experienced by a free-falling object). For other situations, such as when objects are subjected to mechanical accelerations from forces other than the resistance of a planetary surface, the weight force is proportional to the mass of an object multiplied by the total acceleration away from free fall, which is called
7482-430: Is the basis by which masses are determined by weighing . In simple spring scales , for example, the force F is proportional to the displacement of the spring beneath the weighing pan, as per Hooke's law , and the scales are calibrated to take g into account, allowing the mass M to be read off. Assuming the gravitational field is equivalent on both sides of the balance, a balance measures relative weight, giving
7656-427: Is the gravitational mass ( standard gravitational parameter ) of the body causing gravitational fields, and R is the radial coordinate (the distance between the centers of the two bodies). By finding the exact relationship between a body's gravitational mass and its gravitational field, Newton provided a second method for measuring gravitational mass. The mass of the Earth can be determined using Kepler's method (from
7830-410: Is theoretically possible to collect an immense number of small objects and form them into an enormous gravitating sphere. However, from a practical standpoint, the gravitational fields of small objects are extremely weak and difficult to measure. Newton's books on universal gravitation were published in the 1680s, but the first successful measurement of the Earth's mass in terms of traditional mass units,
8004-520: The AK-74 and AKS-74U . However, some carbines, such as the M1 carbine , are not a variant of any existing design and are their own firearm model. Carbines are regardless very similar to rifles and often have the same actions (single-shot, lever-action, bolt-action, semi-automatic, automatic, etc.). This similarity has given carbines the alternate name of short barreled rifle (SBR), though this more accurately describes
8178-551: The Ancient and Medieval eras. Some hosts were mostly cavalry, particularly in nomadic societies of Asia , notably the Huns of Attila and the later Mongol armies . In Europe, cavalry became increasingly armoured (heavy), and eventually evolving into the mounted knights of the medieval period. During the 17th century, cavalry in Europe discarded most of its armor, which was ineffective against
8352-596: The Battle of Carrhae , the Romans learned the importance of large cavalry formations from the Parthians . At the same time heavy spears and shields modelled on those favoured by the horsemen of the Greek city-states were adopted to replace the lighter weaponry of early Rome. These improvements in tactics and equipment reflected those of a thousand years earlier when the first Iranians to reach
8526-462: The Cavendish experiment , did not occur until 1797, over a hundred years later. Henry Cavendish found that the Earth's density was 5.448 ± 0.033 times that of water. As of 2009, the Earth's mass in kilograms is only known to around five digits of accuracy, whereas its gravitational mass is known to over nine significant figures. Given two objects A and B, of masses M A and M B , separated by
8700-632: The Dayuan for this reason, since the Dayuan were hoarding a massive amount of tall, strong, Central Asian bred horses in the Hellenized – Greek region of Fergana (established slightly earlier by Alexander the Great ). Although experiencing some defeats early on in the campaign, Emperor Wu's war from 104 BC to 102 BC succeeded in gathering the prized tribute of horses from Fergana. Cavalry tactics in China were enhanced by
8874-587: The FG 42 , Gewehr 43 , FN FAL , Howa Type 64 , and Desert Tech MDR . A sniper rifle is, per widespread definition, a high-powered precision rifle, often bolt-action or semi-automatic, with an effective range farther than that of a standard rifle. Though any rifle in a sniper configuration (usually with a telescopic sight and bipod ) can be considered a sniper rifle, most sniper rifles are purpose-built for their applications, or are variants of existing rifles that have been modified to function as sniper rifles, such as
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#17330859413949048-589: The Glock , Browning Hi-Power , M1911 pistol , Makarov pistol , Walther PP , Luger pistol , Mauser C96 , and Beretta 92 . Examples of revolvers include the Colt Single Action Army , Smith & Wesson Model 10 , Colt Official Police , Colt Python , New Nambu M60 , and Mateba Autorevolver . Examples of derringers include the Remington Model 95 , FP-45 Liberator , and COP .357 Derringer . A long gun
9222-614: The Hellas . Similarly, the men of the Mountain Land from north of Kabul -River equivalent to medieval Kohistan (Pakistan), figure in the army of Darius III against Alexander at Arbela , providing a cavalry force and 15 elephants. This obviously refers to Kamboja cavalry south of Hindukush. The Kambojas were famous for their horses, as well as cavalrymen ( asva-yuddha-Kushalah ). On account of their supreme position in horse (Ashva) culture, they were also popularly known as Ashvakas , i.e.
9396-450: The Ippiko (or "Horserider"), Greek "heavy" cavalry, armed with kontos (or cavalry lance), and sword. These wore leather armour or mail plus a helmet. They were medium rather than heavy cavalry, meaning that they were better suited to be scouts, skirmishers, and pursuers rather than front line fighters. The effectiveness of this combination of cavalry and infantry helped to break enemy lines and
9570-573: The Iranian Plateau forced the Assyrians to undertake similar reform. Nonetheless, the Romans would continue to rely mainly on their heavy infantry supported by auxiliary cavalry. In the army of the late Roman Empire , cavalry played an increasingly important role. The Spatha , the classical sword throughout most of the 1st millennium was adopted as the standard model for the Empire's cavalry forces. By
9744-500: The M26 Modular Accessory Shotgun System . Shotguns are still popular with civilians for the suitability of their shot spread in hunting, clay pigeon shooting , and home defense. Double-barreled shotguns are break-action shotguns with two parallel barrels (horizontal side-by-side or vertical over-and-under), allowing two single shots that can be loaded and fired in quick succession. Examples of shotguns include
9918-509: The MP 18 , MP 40 , Thompson submachine gun , M3 submachine gun , Uzi , Heckler & Koch MP5 , Spectre M4 , Steyr TMP , Heckler & Koch UMP , PP-2000 , KRISS Vector , and SIG MPX . A personal defense weapon is, in simplest terms, a submachine gun that is designed to fire ammunition with ballistic performance that is similar to (but not actually a type of) rifle cartridges, often called "sub-intermediate" cartridges. In this way, it combines
10092-649: The Mauser Tankgewehr M1918 , Boys anti-tank rifle , PTRS-41 , Barrett M82 , Gepárd anti-materiel rifle , and McMillan TAC-50 . Examples of designated marksman rifles include the SVD , SR-25 , Dragunov SVU , Marine Scout Sniper Rifle , Mk 14 Enhanced Battle Rifle , and M110 Semi-Automatic Sniper System . An automatic rifle is a magazine-fed rifle that is capable of automatic fire. They include most assault rifles and battle rifles, but originated as their own category of rifles capable of automatic fire, as opposed to
10266-784: The National Firearms Act and Firearm Owners Protection Act define a "machine gun" in United States Code Title 26, Subtitle E, Chapter 53, Subchapter B, Part 1, § 5845 as "... any firearm which shoots ... automatically more than one shot, without manual reloading, by a single function of the trigger". "Machine gun" is therefore largely synonymous with "automatic weapon" in American civilian parlance, covering all automatic firearms. In most jurisdictions, automatic rifles, as well as automatic firearms in general, are prohibited from civilian purchase or are at least heavily restricted; in
10440-630: The Raghu Vamsa epic poem of Sanskrit poet Kalidasa . Raghu of Kalidasa is believed to be Chandragupta II ( Vikaramaditya ) (375–413/15 AD), of the well-known Gupta dynasty . As late as the mediaeval era, the Kamboja cavalry had also formed part of the Gurjara-Pratihara armed forces from the eighth to the 10th centuries AD. They had come to Bengal with the Pratiharas when the latter conquered part of
10614-617: The Sintashta-Petrovka culture in Central Asia and spread by nomadic or semi-nomadic Indo-Iranians . The chariot was quickly adopted by settled peoples both as a military technology and an object of ceremonial status, especially by the pharaohs of the New Kingdom of Egypt from 1550 BC as well as the Assyrian army and Babylonian royalty. The power of mobility given by mounted units
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#173308594139410788-532: The Solar System . On 25 August 1609, Galileo Galilei demonstrated his first telescope to a group of Venetian merchants, and in early January 1610, Galileo observed four dim objects near Jupiter, which he mistook for stars. However, after a few days of observation, Galileo realized that these "stars" were in fact orbiting Jupiter. These four objects (later named the Galilean moons in honor of their discoverer) were
10962-638: The Springfield Armory (United States), the Royal Small Arms Factory (United Kingdom), Mauser (Germany), Steyr-Daimler-Puch (Austria), and Rock Island Armory under Armscor (Philippines). As of 2018 the Small Arms Survey reported that there were over one billion firearms distributed globally, of which 857 million (about 85 percent) were in civilian hands. U.S. civilians alone account for 393 million (about 46 percent) of
11136-464: The StG 44 produced by Nazi Germany during World War II , assault rifles have since become extremely popular among militaries and other armed groups due to their universal versatility, and they have made up the vast majority of standard-issue military service rifles since the mid-20th century. Various configurations of assault rifle exist, such as the bullpup , in which the firing grip is located in front of
11310-550: The Standard Model . The concept of amount is very old and predates recorded history . The concept of "weight" would incorporate "amount" and acquire a double meaning that was not clearly recognized as such. What we now know as mass was until the time of Newton called “weight.” ... A goldsmith believed that an ounce of gold was a quantity of gold. ... But the ancients believed that a beam balance also measured “heaviness” which they recognized through their muscular senses. ... Mass and its associated downward force were believed to be
11484-539: The Type 97 sniper rifle , which was essentially a standard Type 38 rifle that was modified to be lighter and come with a telescopic sight. Related developments are anti-materiel rifles , large-caliber rifles designed to destroy enemy materiel such as vehicles, supplies, or hardware; anti-tank rifles , anti-materiel rifles that were designed specifically to combat early armoured fighting vehicles , but are now largely obsolete due to advances in vehicle armour ; scout rifles ,
11658-514: The Waffen SS ). Most cavalry units that are horse-mounted in modern armies serve in purely ceremonial roles, or as mounted infantry in difficult terrain such as mountains or heavily forested areas. Modern usage of the term generally refers to units performing the role of reconnaissance, surveillance, and target acquisition (analogous to historical light cavalry) or main battle tank units (analogous to historical heavy cavalry). Historically, cavalry
11832-520: The Winchester Model 1892 , Rifle No. 5 Mk I , SKS , M1 carbine , Ruger Mini-14 , M4 carbine , and Kel-Tec SUB-2000 . An assault rifle is commonly defined as a selective-fire rifle chambered in an intermediate cartridge (such as 5.56×45mm NATO , 7.62×39mm , 5.45×39mm , and .300 AAC Blackout ) and fed with a detachable magazine . Assault rifles are also usually smaller than full-sized rifles such as battle rifles . Originating with
12006-425: The Winchester Model 1897 , Browning Auto-5 , Ithaca 37 , Remington Model 870 , Mossberg 500 , Benelli M4 , Franchi SPAS-12 , Atchisson AA-12 , and Knight's Armament Company Masterkey . A carbine is a long gun, usually a rifle, that has had its barrel shortened from its original length or is of a certain size smaller than standard rifles, but is still large enough to be considered a long gun. How considerable
12180-633: The breech instead of behind it. Examples of assault rifles include the Kalashnikov rifles of Soviet and Russian origin (such as the AK-47 , AKM , and AK-74 ), as well as the American M4 carbine and M16 rifle . A battle rifle is commonly defined as a semi-automatic or selective-fire rifle that is larger or longer than an assault rifle and is chambered in a "full-power" cartridge (e.g. 7.62×51mm NATO , 7.92×57mm Mauser , 7.62×54mmR ). The term originated as
12354-405: The carob seed ( carat or siliqua ) as a measurement standard. If an object's weight was equivalent to 1728 carob seeds , then the object was said to weigh one Roman pound. If, on the other hand, the object's weight was equivalent to 144 carob seeds then the object was said to weigh one Roman ounce (uncia). The Roman pound and ounce were both defined in terms of different sized collections of
12528-492: The elementary charge . Non-SI units accepted for use with SI units include: Outside the SI system, other units of mass include: In physical science , one may distinguish conceptually between at least seven different aspects of mass , or seven physical notions that involve the concept of mass . Every experiment to date has shown these seven values to be proportional , and in some cases equal, and this proportionality gives rise to
12702-442: The melting point of ice. However, because precise measurement of a cubic decimetre of water at the specified temperature and pressure was difficult, in 1889 the kilogram was redefined as the mass of a metal object, and thus became independent of the metre and the properties of water, this being a copper prototype of the grave in 1793, the platinum Kilogramme des Archives in 1799, and the platinum–iridium International Prototype of
12876-416: The proper acceleration . Through such mechanisms, objects in elevators, vehicles, centrifuges, and the like, may experience weight forces many times those caused by resistance to the effects of gravity on objects, resulting from planetary surfaces. In such cases, the generalized equation for weight W of an object is related to its mass m by the equation W = – ma , where a is the proper acceleration of
13050-431: The samurai aristocracy led to the development of armoured horse archers, themselves to develop into charging lancer cavalry as gunpowder weapons rendered bows obsolete. Japanese cavalry was largely made up of landowners who would be upon a horse to better survey the troops they were called upon to bring to an engagement, rather than traditional mounted warfare seen in other cultures with massed cavalry units. An example
13224-453: The torsion balance pendulum, in 1889. As of 2008 , no deviation from universality, and thus from Galilean equivalence, has ever been found, at least to the precision 10 . More precise experimental efforts are still being carried out. The universality of free-fall only applies to systems in which gravity is the only acting force. All other forces, especially friction and air resistance , must be absent or at least negligible. For example, if
13398-563: The trousers of the nomads as well as practice the nomads' form of mounted archery to hone their new cavalry skills. The adoption of massed cavalry in China also broke the tradition of the chariot -riding Chinese aristocracy in battle, which had been in use since the ancient Shang dynasty ( c. 1600 –1050 BC). By this time large Chinese infantry-based armies of 100,000 to 200,000 troops were now buttressed with several hundred thousand mounted cavalry in support or as an effective striking force. The handheld pistol-and-trigger crossbow
13572-444: The "Galilean equivalence principle" or the " weak equivalence principle " has the most important consequence for freely falling objects. Suppose an object has inertial and gravitational masses m and M , respectively. If the only force acting on the object comes from a gravitational field g , the force on the object is: Given this force, the acceleration of the object can be determined by Newton's second law: Putting these together,
13746-835: The "horsemen" and their land was known as "Home of Horses". They are the Assakenoi and Aspasioi of the Classical writings, and the Ashvakayanas and Ashvayanas in Pāṇini 's Ashtadhyayi . The Assakenoi had faced Alexander with 30,000 infantry, 20,000 cavalry and 30 war elephants. Scholars have identified the Assakenoi and Aspasioi clans of Kunar and Swat valleys as a section of the Kambojas . These hardy tribes had offered stubborn resistance to Alexander ( c. 326 BC ) during latter's campaign of
13920-400: The 17th century have demonstrated that inertial and gravitational mass are identical; since 1915, this observation has been incorporated a priori in the equivalence principle of general relativity . The International System of Units (SI) unit of mass is the kilogram (kg). The kilogram is 1000 grams (g), and was first defined in 1795 as the mass of one cubic decimetre of water at
14094-865: The 19th and 20th centuries, various types of long guns have been created for different purposes. A rifle is a long gun that has riflings (spiral grooves) machined into the bore (inner) surface of its barrel, imparting a gyroscopically stabilizing spin to the bullets that it fires. A descendant of the musket, rifles produce a single point of impact with each firing with a long range and high accuracy. For this reason, as well as for their ubiquity, rifles are very popular among militaries as service rifles , police as accurate long-range alternatives to their traditional shotgun long guns, and civilians for hunting , shooting sports , and self-defense . Many types of rifles exist owing to their wide adoption and versatility, ranging from mere barrel length differences as in short-barreled rifles and carbines , to classifications per
14268-426: The 20th century, but have since been superseded in most combat roles by rifles, carbines, and personal defense weapons due to their low effective range and poor penetration against most body armor developed since the late 20th century. However, they remain popular among special forces and police for their effectiveness in close-quarters and low likelihood to overpenetrate targets. Examples of submachine guns include
14442-456: The 6th century these had evolved into lengthy straight weapons influenced by Persian and other eastern patterns. Other specialist weapons during this period included javelins, long reaching lancers, axes and maces. The most widespread employment of heavy cavalry at this time was found in the forces of the Iranian empires, the Parthians and their Persian Sasanian successors. Both, but especially
14616-520: The Goryeo military into a professional army that would contain decent and well-trained cavalry units. In 1107, the Jurchen were ultimately defeated, and surrendered to Yun Kwan. To mark the victory, General Yun built nine fortresses to the northeast of the Goryeo–Jurchen borders (동북 9성, 東北 九城). The ancient Japanese of the Kofun period also adopted cavalry and equine culture by the 5th century AD. The emergence of
14790-752: The Kabul, Kunar and Swat valleys and had even extracted the praise of the Alexander's historians. These highlanders, designated as "parvatiya Ayudhajivinah" in Pāṇini's Astadhyayi, were rebellious, fiercely independent and freedom-loving cavalrymen who never easily yielded to any overlord. The Sanskrit drama Mudra-rakashas by Visakha Dutta and the Jaina work Parishishtaparvan refer to Chandragupta 's ( c. 320 BC – c. 298 BC ) alliance with Himalayan king Parvataka . The Himalayan alliance gave Chandragupta
14964-503: The Kamboja cavalry frequently played role in ancient wars. V. R. Ramachandra Dikshitar writes: "Both the Puranas and the epics agree that the horses of the Sindhu and Kamboja regions were of the finest breed, and that the services of the Kambojas as cavalry troopers were utilised in ancient wars". J.A.O.S. writes: "Most famous horses are said to come either from Sindhu or Kamboja; of the latter (i.e.
15138-658: The Kamboja), the Indian epic Mahabharata speaks among the finest horsemen". The Mahabharata speaks of the esteemed cavalry of the Kambojas, Sakas, Yavanas and Tusharas , all of whom had participated in the Kurukshetra war under the supreme command of Kamboja ruler Sudakshin Kamboj . Mahabharata and Vishnudharmottara Purana pay especial attention to the Kambojas, Yavansa, Gandharas etc. being ashva.yuddha.kushalah (expert cavalrymen). In
15312-654: The Kilogram (IPK) in 1889. However, the mass of the IPK and its national copies have been found to drift over time. The re-definition of the kilogram and several other units came into effect on 20 May 2019, following a final vote by the CGPM in November 2018. The new definition uses only invariant quantities of nature: the speed of light , the caesium hyperfine frequency , the Planck constant and
15486-705: The Mahabharata war, the Kamboja cavalry along with that of the Sakas, Yavanas is reported to have been enlisted by the Kuru king Duryodhana of Hastinapura . Herodotus ( c. 484 – c. 425 BC ) attests that the Gandarian mercenaries (i.e. Gandharans/Kambojans of Gandari Strapy of Achaemenids ) from the 20th strapy of the Achaemenids were recruited in the army of emperor Xerxes I (486–465 BC), which he led against
15660-479: The U.S. for instance, most automatic rifles are Title II weapons that require certain licenses and are greatly regulated. Examples of automatic rifles include the Cei-Rigotti , Lewis gun , Fedorov Avtomat , and M1918 Browning automatic rifle . A machine gun is a fully-automatic firearm, chambered in intermediate or full-power rifle cartridges, designed to provide sustained automatic direct fire as opposed to
15834-584: The ability to close in on their opponents; and finally those whose equipment allowed them to fight either on horseback or foot. The role of horsemen did however remain secondary to that of the hoplites or heavy infantry who comprised the main strength of the citizen levies of the various city states. Cavalry played a relatively minor role in ancient Greek city-states , with conflicts decided by massed armored infantry. However, Thebes produced Pelopidas , their first great cavalry commander, whose tactics and skills were absorbed by Philip II of Macedon when Philip
16008-428: The abstract concept of mass. There are a number of ways mass can be measured or operationally defined : In everyday usage, mass and " weight " are often used interchangeably. For instance, a person's weight may be stated as 75 kg. In a constant gravitational field, the weight of an object is proportional to its mass, and it is unproblematic to use the same unit for both concepts. But because of slight differences in
16182-620: The appearance of new, larger breeds of horses. The replacement of the Roman saddle by variants on the Scythian model, with pommel and cantle, was also a significant factor as was the adoption of stirrups and the concomitant increase in stability of the rider's seat. Armored cataphracts began to be deployed in Eastern Europe and the Near East, following the precedents established by Persian forces, as
16356-473: The back of a horse was much more difficult than mere riding. The cavalry acted in pairs; the reins of the mounted archer were controlled by his neighbour's hand. Even at this early time, cavalry used swords, shields, spears, and bows. The sculpture implies two types of cavalry, but this might be a simplification by the artist. Later images of Assyrian cavalry show saddle cloths as primitive saddles, allowing each archer to control his own horse. As early as 490 BC
16530-593: The best places to see yabusame performed are at the Tsurugaoka Hachiman-gū in Kamakura and Shimogamo Shrine in Kyoto (during Aoi Matsuri in early May). It is also performed in Samukawa and on the beach at Zushi, as well as other locations. Kasagake or Kasakake (笠懸, かさがけ lit. "hat shooting") is a type of Japanese mounted archery. In contrast to yabusame, the types of targets are various and the archer shoots without stopping
16704-839: The bolt-action and semi-automatic rifles commonly issued to infantry at the time of their invention. They usually have smaller magazine capacities than machine guns ; the French Chauchat had a 20-round box magazine, while the Hotchkiss Mle 1914 machine gun , the French Army 's standard machine gun at the time, was fed by a 250-round ammunition belt . Though automatic rifles are sometimes considered to be their own category, they are also occasionally considered to be other types of firearms that postdated their invention, usually as light machine guns . Automatic rifles are sometimes confused with machine guns or vice versa, or are defined as such by law;
16878-551: The character of bureaucratic nation-states supporting professional standing armies, recruitment of these mounted warriors was undertaken in order to fill the strategic roles of scouts and raiders. The best known instance of the continued employment of mounted tribal auxiliaries were the Cossack cavalry regiments of the Russian Empire . In Eastern Europe , and out onto the steppes , cavalry remained important much longer and dominated
17052-495: The civilian market, albeit often with longer barrels. Examples of personal defense weapons include the FN P90 , Heckler & Koch MP7 , AAC Honey Badger , and ST Kinetics CPW . Types aside, firearms are also categorized by their "action", which describes their loading, firing, and unloading cycle. Manual action or manual operation is essentially any type of firearm action that is loaded, and usually also fired, one cartridge at
17226-405: The classical theory offers no compelling reason why the gravitational mass has to equal the inertial mass. That it does is merely an empirical fact. Albert Einstein developed his general theory of relativity starting with the assumption that the inertial and passive gravitational masses are the same. This is known as the equivalence principle . The particular equivalence often referred to as
17400-699: The design's primary intended use (e.g. hunting rifle), or to the commonly accepted name for a particular variation (e.g. Gatling gun ). Shooters aim firearms at their targets with hand-eye coordination , using either iron sights or optical sights . The accurate range of pistols generally does not exceed 100 metres (110 yd; 330 ft), while most rifles are accurate to 500 metres (550 yd; 1,600 ft) using iron sights, or to longer ranges whilst using optical sights. Purpose-built sniper rifles and anti-materiel rifles are accurate to ranges of more than 2,000 metres (2,200 yd). (Firearm rounds may be dangerous or lethal well beyond their accurate range;
17574-507: The difference is between a rifle and a carbine varies; for example, the standard Heckler & Koch G36 's barrel has a length of 480 mm (18.9 in), the G36K carbine variant's barrel is 318 mm (12.5 in), and the G36C compact variant's barrel is 228 mm (9.0 in). Some carbines are also redesigned compared to their rifle counterparts, such as the aforementioned G36/G36K and G36C, or
17748-470: The double of the distance between the two bodies. Hooke urged Newton, who was a pioneer in the development of calculus , to work through the mathematical details of Keplerian orbits to determine if Hooke's hypothesis was correct. Newton's own investigations verified that Hooke was correct, but due to personal differences between the two men, Newton chose not to reveal this to Hooke. Isaac Newton kept quiet about his discoveries until 1684, at which time he told
17922-434: The elapsed time could be measured. The ball was allowed to roll a known distance down the ramp, and the time taken for the ball to move the known distance was measured. The time was measured using a water clock described as follows: Galileo found that for an object in free fall, the distance that the object has fallen is always proportional to the square of the elapsed time: Galileo had shown that objects in free fall under
18096-497: The exact number of carob seeds that would be required to produce a gravitational field similar to that of the Earth or Sun. In fact, by unit conversion it is a simple matter of abstraction to realize that any traditional mass unit can theoretically be used to measure gravitational mass. Measuring gravitational mass in terms of traditional mass units is simple in principle, but extremely difficult in practice. According to Newton's theory, all objects produce gravitational fields and it
18270-410: The feather should hit the ground at exactly the same time (assuming the acceleration of both objects towards each other, and of the ground towards both objects, for its own part, is negligible). This can easily be done in a high school laboratory by dropping the objects in transparent tubes that have the air removed with a vacuum pump. It is even more dramatic when done in an environment that naturally has
18444-423: The firearm's action must be reloaded or charged via an internal mechanism between trigger pulls. Types of manual actions include lever action, bolt action, and pump action. Lever action is a repeating action that is operated by using a cocking handle (the "lever") located around the trigger guard area (often incorporating it) that is pulled down then back up to move the bolt via internal linkages and cock
18618-404: The first celestial bodies observed to orbit something other than the Earth or Sun. Galileo continued to observe these moons over the next eighteen months, and by the middle of 1611, he had obtained remarkably accurate estimates for their periods. Sometime prior to 1638, Galileo turned his attention to the phenomenon of objects in free fall, attempting to characterize these motions. Galileo was not
18792-402: The first paragraph of Principia , Newton defined quantity of matter as “density and bulk conjunctly”, and mass as quantity of matter. The quantity of matter is the measure of the same, arising from its density and bulk conjunctly. ... It is this quantity that I mean hereafter everywhere under the name of body or mass. And the same is known by the weight of each body; for it is proportional to
18966-436: The first to investigate Earth's gravitational field, nor was he the first to accurately describe its fundamental characteristics. However, Galileo's reliance on scientific experimentation to establish physical principles would have a profound effect on future generations of scientists. It is unclear if these were just hypothetical experiments used to illustrate a concept, or if they were real experiments performed by Galileo, but
19140-626: The former, were famed for the cataphract (fully armored cavalry armed with lances) even though the majority of their forces consisted of lighter horse archers . The West first encountered this eastern heavy cavalry during the Hellenistic period with further intensive contacts during the eight centuries of the Roman–Persian Wars . At first the Parthians' mobility greatly confounded the Romans, whose armoured close-order infantry proved unable to match
19314-560: The gap between Galileo's gravitational acceleration and Kepler's elliptical orbits. It appeared in Newton's 1728 book A Treatise of the System of the World . According to Galileo's concept of gravitation, a dropped stone falls with constant acceleration down towards the Earth. However, Newton explains that when a stone is thrown horizontally (meaning sideways or perpendicular to Earth's gravity) it follows
19488-403: The global total of small arms. A handgun is, as defined generally and in many gun laws , a firearm that can be used with a single hand. They are the smallest of all firearms, and are common as sidearms , concealed carry weapons, or as backup weapons for self-defense . Handguns can be categorized into two broad types: pistols , which have a single fixed firing chamber machined into
19662-421: The gravitational acceleration is given by: This says that the ratio of gravitational to inertial mass of any object is equal to some constant K if and only if all objects fall at the same rate in a given gravitational field. This phenomenon is referred to as the "universality of free-fall". In addition, the constant K can be taken as 1 by defining our units appropriately. The first experiments demonstrating
19836-457: The high automatic rate of fire, reliable low recoil, and lightweight compact maneuverability of submachine guns with the versatility, penetration, and effective range of rifles, effectively making them an "in-between" of submachine guns and carbines. Personal defense weapons were developed to provide rear and "second-line" personnel not otherwise armed with high-caliber firearms (vehicle and weapon crews, engineers, logistical personnel, etc.) with
20010-467: The horse. While yabusame has been played as a part of formal ceremonies, kasagake has developed as a game or practice of martial arts, focusing on technical elements of horse archery. In the Indian subcontinent, cavalry played a major role from the Gupta dynasty (320–600) period onwards. India has also the oldest evidence for the introduction of toe- stirrups . Indian literature contains numerous references to
20184-626: The influence of the Earth's gravitational field have a constant acceleration, and Galileo's contemporary, Johannes Kepler, had shown that the planets follow elliptical paths under the influence of the Sun's gravitational mass. However, Galileo's free fall motions and Kepler's planetary motions remained distinct during Galileo's lifetime. According to K. M. Browne: "Kepler formed a [distinct] concept of mass ('amount of matter' ( copia materiae )), but called it 'weight' as did everyone at that time." Finally, in 1686, Newton gave this distinct concept its own name. In
20358-431: The invention of the saddle-attached stirrup by at least the 4th century, as the oldest reliable depiction of a rider with paired stirrups was found in a Jin dynasty tomb of the year 322 AD. The Chinese invention of the horse collar by the 5th century was also a great improvement from the breast harness, allowing the horse to haul greater weight without heavy burden on its skeletal structure. The horse warfare of Korea
20532-490: The main striking force of the armies in contrast to the earlier roles of cavalry as scouts, raiders, and outflankers. The late-Roman cavalry tradition of organized units in a standing army differed fundamentally from the nobility of the Germanic invaders—individual warriors who could afford to provide their own horses and equipment. While there was no direct linkage with these predecessors the early medieval knight also developed as
20706-417: The measurable mass of an object increases when energy is added to it (for example, by increasing its temperature or forcing it near an object that electrically repels it.) This motivates a search for a different definition of mass that is more accurate than the traditional definition of "the amount of matter in an object". Firearm A firearm is any type of gun that uses an explosive charge and
20880-836: The minimum distance for safety is much greater than the specified range for accuracy.) A firearm is a barreled ranged weapon that inflicts damage on targets by launching one or more projectiles driven by rapidly expanding high-pressure gas produced by exothermic combustion ( deflagration ) of a chemical propellant , historically black powder , now smokeless powder . In the military, firearms are categorized into heavy and light weapons regarding their portability by infantry . Light firearms are those that can be readily carried by individual foot soldier , though they might still require more than one individual ( crew-served ) to achieve optimal operational capacity. Heavy firearms are those that are too large and heavy to be transported on foot, or too unstable against recoil , and thus require
21054-544: The motion of bodies in an orbit"). Halley presented Newton's findings to the Royal Society of London, with a promise that a fuller presentation would follow. Newton later recorded his ideas in a three-book set, entitled Philosophiæ Naturalis Principia Mathematica (English: Mathematical Principles of Natural Philosophy ). The first was received by the Royal Society on 28 April 1685–86; the second on 2 March 1686–87; and
21228-598: The mounted warriors of the Central Asian horse nomads, notably the Sakas , Kambojas , Yavanas , Pahlavas and Paradas . Numerous Puranic texts refer to a conflict in ancient India (16th century BC) in which the horsemen of five nations, called the "Five Hordes" ( pañca.ganan ) or Kṣatriya hordes ( Kṣatriya ganah ), attacked and captured the state of Ayudhya by dethroning its Vedic King Bahu The Mahabharata , Ramayana , numerous Puranas and some foreign sources attest that
21402-512: The musket; both having single-shot , break-action , bolt-action , lever-action , pump-action , semi-automatic , and automatic variants; and both being popular with militaries, police, and civilians for largely the same reasons. However, unlike rifles, shotguns are less favored in combat roles due to their low accuracy and limited effectiveness in modern warfare , with combat shotguns often only used for breaching or close-quarters combat and sometimes limited to underbarrel attachments such as
21576-490: The muskets and cannons that were coming into common use, and by the mid-18th century armor had mainly fallen into obsolescence, although some regiments retained a small thickened cuirass that offered protection against lances, sabres, and bayonets; including some protection against a shot from distance. In the interwar period many cavalry units were converted into motorized infantry and mechanized infantry units, or reformed as tank troops. The cavalry tank or cruiser tank
21750-403: The nearby gravitational field. No matter how strong the gravitational field, objects in free fall are weightless , though they still have mass. The force known as "weight" is proportional to mass and acceleration in all situations where the mass is accelerated away from free fall. For example, when a body is at rest in a gravitational field (rather than in free fall), it must be accelerated by
21924-504: The north, on the other hand, developed a strong cavalry force that culminated in the hetairoi ( Companion cavalry ) of Philip II of Macedon and Alexander the Great . In addition to these heavy cavalry, the Macedonian army also employed lighter horsemen called prodromoi for scouting and screening, as well as the Macedonian pike phalanx and various kinds of light infantry . There were also
22098-399: The notable exception of smoothbore shotguns ) have rifled barrels to impart spin to the projectile for improved flight stability. Modern firearms can be described by their caliber (i.e. bore diameter). For pistols and rifles this is given in millimeters or inches (e.g. 7.62mm or .308 in.); in the case of shotguns, gauge or bore (e.g. 12 ga. or .410 bore.). They are also described by
22272-509: The object caused by all influences other than gravity. (Again, if gravity is the only influence, such as occurs when an object falls freely, its weight will be zero). Although inertial mass, passive gravitational mass and active gravitational mass are conceptually distinct, no experiment has ever unambiguously demonstrated any difference between them. In classical mechanics , Newton's third law implies that active and passive gravitational mass must always be identical (or at least proportional), but
22446-430: The object from going into free fall. By contrast, on the surface of the Moon, the same object still has a mass of 50 kilograms but weighs only 81.5 newtons, because only 81.5 newtons is required to keep this object from going into a free fall on the moon. Restated in mathematical terms, on the surface of the Earth, the weight W of an object is related to its mass m by W = mg , where g = 9.80665 m/s
22620-412: The orbit of Earth's Moon), or it can be determined by measuring the gravitational acceleration on the Earth's surface, and multiplying that by the square of the Earth's radius. The mass of the Earth is approximately three-millionths of the mass of the Sun. To date, no other accurate method for measuring gravitational mass has been discovered. Newton's cannonball was a thought experiment used to bridge
22794-583: The outcome of the battle, hence the later term battle cavalry . Light cavalry, such as horse archers , hussars , and Cossack cavalry, were assigned all the numerous roles that were ill-suited to more narrowly-focused heavy forces. This includes scouting , deterring enemy scouts, foraging , raiding , skirmishing , pursuit of retreating enemy forces, screening of retreating friendly forces, linking separated friendly forces, and countering enemy light forces in all these same roles. Light and heavy cavalry roles continued through early modern warfare , but armor
22968-409: The planets orbit the Sun. In Kepler's final planetary model, he described planetary orbits as following elliptical paths with the Sun at a focal point of the ellipse . Kepler discovered that the square of the orbital period of each planet is directly proportional to the cube of the semi-major axis of its orbit, or equivalently, that the ratio of these two values is constant for all planets in
23142-400: The presence of an applied force. The inertia and the inertial mass describe this property of physical bodies at the qualitative and quantitative level respectively. According to Newton's second law of motion , if a body of fixed mass m is subjected to a single force F , its acceleration a is given by F / m . A body's mass also determines the degree to which it generates and is affected by
23316-601: The province. Ancient Kambojas organised military sanghas and shrenis (corporations) to manage their political and military affairs, as Arthashastra of Kautiliya as well as the Mahabharata record. They are described as Ayuddha-jivi or Shastr-opajivis (nations-in-arms), which also means that the Kamboja cavalry offered its military services to other nations as well. There are numerous references to Kambojas having been requisitioned as cavalry troopers in ancient wars by outside nations . Inertial mass Mass
23490-734: The rear of the barrel, and are often loaded using magazines of varying capacities; revolvers , which have a number of firing chambers or "charge holes" in a revolving cylinder , each one loaded with a single cartridge or charge; and derringers , broadly defined as any handgun that is not a traditional pistol nor a revolver. There are various types of the aforementioned handguns designed for different mechanisms or purposes, such as single-shot , manual repeating , semi-automatic , or automatic pistols; single-action , double-action , or double-action/single-action revolvers; and small, compact handguns for concealed carry such as pocket pistols and " Saturday night specials ". Examples of pistols include
23664-464: The relative gravitation mass of each object. Mass was traditionally believed to be a measure of the quantity of matter in a physical body, equal to the "amount of matter" in an object. For example, Barre´ de Saint-Venant argued in 1851 that every object contains a number of "points" (basically, interchangeable elementary particles), and that mass is proportional to the number of points the object contains. (In practice, this "amount of matter" definition
23838-547: The results obtained from these experiments were both realistic and compelling. A biography by Galileo's pupil Vincenzo Viviani stated that Galileo had dropped balls of the same material, but different masses, from the Leaning Tower of Pisa to demonstrate that their time of descent was independent of their mass. In support of this conclusion, Galileo had advanced the following theoretical argument: He asked if two bodies of different masses and different rates of fall are tied by
24012-523: The rifle's function and purpose as in semi-automatic rifles , automatic rifles and sniper rifles , to differences in the rifle's action as in single-shot , break-action , bolt-action , and lever-action rifles. Examples of rifles of various types include the Henry rifle , Winchester rifle , Lee–Enfield , Gewehr 98 , M1 Garand , MAS-36 rifle , AKM , Ruger 10/22 , Heckler & Koch G3 , Remington Model 700 , and Heckler & Koch HK417 . A shotgun
24186-631: The rise of true cavalry, were an innovation of equestrian nomads of the Eurasian Steppe and pastoralist tribes such as the Iranic Parthians and Sarmatians . Together with a core of armoured lancers, these were predominantly horse archers using the Parthian shot tactic. The photograph straight above shows Assyrian cavalry from reliefs of 865–860 BC. At this time, the men had no spurs , saddles , saddle cloths , or stirrups . Fighting from
24360-503: The same common mass standard, the carob seed. The ratio of a Roman ounce (144 carob seeds) to a Roman pound (1728 carob seeds) was: In 1600 AD, Johannes Kepler sought employment with Tycho Brahe , who had some of the most precise astronomical data available. Using Brahe's precise observations of the planet Mars, Kepler spent the next five years developing his own method for characterizing planetary motion. In 1609, Johannes Kepler published his three laws of planetary motion, explaining how
24534-510: The same purposes. However, some prefer battle rifles for their more powerful cartridge, despite the added recoil. Some designated marksman rifles are configured from battle rifles, such as the Mk 14 Enhanced Battle Rifle and United States Marine Corps Designated Marksman Rifle , both essentially heavily modified and modernized variants of the M14 rifle . Examples of rifles considered to be battle rifles include
24708-407: The same thing. Humans, at some early era, realized that the weight of a collection of similar objects was directly proportional to the number of objects in the collection: where W is the weight of the collection of similar objects and n is the number of objects in the collection. Proportionality, by definition, implies that two values have a constant ratio : An early use of this relationship
24882-457: The scene of warfare until the early 17th century and even beyond, as the strategic mobility of cavalry was crucial for the semi-nomadic pastoralist lives that many steppe cultures led. Tibetans also had a tradition of cavalry warfare, in several military engagements with the Chinese Tang dynasty (618–907 AD). Further east, the military history of China , specifically northern China , held
25056-596: The semi-automatic or burst fire of standard rifles. They are commonly associated with being belt-fed , though many machine guns are also fed by box, drum, pan, or hopper magazines. They generally have a high rate of fire and a large ammunition capacity, and are often used for suppressive fire to support infantry advances or defend positions from enemy assaults. Owing to their versatility and firepower, they are also commonly installed on military vehicles and military aircraft , either as main or ancillary weapons . Many machine guns are individual-served and can be operated by
25230-586: The size of carbines and short-barreled rifles, and use similar configurations. Many are designed to take as little space as possible for use in close-quarters or for easy storage in vehicles and cases. Some submachine guns are designed and configured similar to pistols even down to size, and are thus occasionally classed as machine pistols , even if they are not actually a handgun (i.e. designed to require two hands to use). Submachine guns are considered ideal for close-quarters combat and are cheap to mass-produce. They were very common in military service through much of
25404-834: The southern Britons met Julius Caesar with chariots in 55 and 54 BC , but by the time of the Roman conquest of Britain a century later chariots were obsolete, even in Britannia. The last mention of chariot use in Britain was by the Caledonians at the Mons Graupius , in 84 AD. During the classical Greek period cavalry were usually limited to those citizens who could afford expensive war-horses. Three types of cavalry became common: light cavalry, whose riders, armed with javelins , could harass and skirmish; heavy cavalry, whose troopers, using lances , had
25578-463: The speed of the Parthians. However, later the Romans would successfully adapt such heavy armor and cavalry tactics by creating their own units of cataphracts and clibanarii . The decline of the Roman infrastructure made it more difficult to field large infantry forces, and during the 4th and 5th centuries cavalry began to take a more dominant role on the European battlefield, also in part made possible by
25752-441: The square of the distance to the body's center. For example, according to Newton's theory of universal gravitation, each carob seed produces a gravitational field. Therefore, if one were to gather an immense number of carob seeds and form them into an enormous sphere, then the gravitational field of the sphere would be proportional to the number of carob seeds in the sphere. Hence, it should be theoretically possible to determine
25926-470: The status of being a cavalryman. As the class grew to be more of a social elite instead of a functional property-based military grouping, the Romans began to employ Italian socii for filling the ranks of their cavalry. The weakness of Roman cavalry was demonstrated by Hannibal Barca during the Second Punic War where he used his superior mounted forces to win several battles. The most notable of these
26100-501: The strength of the Earth's gravitational field at different places, the distinction becomes important for measurements with a precision better than a few percent, and for places far from the surface of the Earth, such as in space or on other planets. Conceptually, "mass" (measured in kilograms ) refers to an intrinsic property of an object, whereas "weight" (measured in newtons ) measures an object's resistance to deviating from its current course of free fall , which can be influenced by
26274-560: The support of a weapons platform (e.g. a fixed mount , wheeled carriage , vehicle , aircraft or water vessel ) to be tactically mobile or useful. The subset of light firearms that only use kinetic projectiles and are compact enough to be operated to full capacity by a single infantryman (individual-served) are also referred to as small arms . Such firearms include handguns such as pistols , revolvers , and derringers ; and long guns such as rifles (and their subtypes), shotguns , submachine guns , and machine guns . Among
26448-455: The term cavalry is still used, referring in modern times to units continuing to fulfill the traditional light cavalry roles, employing fast armored cars , light tanks , and infantry fighting vehicles instead of horses, while air cavalry employs helicopters . Before the Iron Age , the role of cavalry on the battlefield was largely performed by light chariots . The chariot originated with
26622-497: The third on 6 April 1686–87. The Royal Society published Newton's entire collection at their own expense in May 1686–87. Isaac Newton had bridged the gap between Kepler's gravitational mass and Galileo's gravitational acceleration, resulting in the discovery of the following relationship which governed both of these: where g is the apparent acceleration of a body as it passes through a region of space where gravitational fields exist, μ
26796-492: The top of a high mountain" with sufficient velocity, "it would reach at last quite beyond the circumference of the Earth, and return to the mountain from which it was projected." In contrast to earlier theories (e.g. celestial spheres ) which stated that the heavens were made of entirely different material, Newton's theory of mass was groundbreaking partly because it introduced universal gravitational mass : every object has gravitational mass, and therefore, every object generates
26970-630: The tribal horsemen wholesale into their armies; and in yet other cases nomadic empires proved eager to enlist Chinese infantry and engineering, as in the case of the Mongol Empire and its sinicized part, the Yuan dynasty (1279–1368). The Chinese recognized early on during the Han dynasty (202 BC – 220 AD) that they were at a disadvantage in lacking the number of horses the northern nomadic peoples mustered in their armies. Emperor Wu of Han (r 141–87 BC) went to war with
27144-456: The type of action employed (e.g. muzzleloader , breechloader , lever , bolt , pump , revolver , semi-automatic , fully automatic , etc.), together with the usual means of deportment (i.e. hand-held or mechanical mounting). Further classification may make reference to the type of barrel used (i.e. rifled ) and to the barrel length (e.g. 24 inches), to the firing mechanism (e.g. matchlock , wheellock , flintlock , or percussion lock ), to
27318-502: The unit was dismissed by Galba after the Batavian Rebellion . For the most part, Roman cavalry during the early Republic functioned as an adjunct to the legionary infantry and formed only one-fifth of the standing force comprising a consular army. Except in times of major mobilisation about 1,800 horsemen were maintained, with three hundred attached to each legion. The relatively low ratio of horsemen to infantry does not mean that
27492-459: The universality of free-fall were—according to scientific 'folklore'—conducted by Galileo obtained by dropping objects from the Leaning Tower of Pisa . This is most likely apocryphal: he is more likely to have performed his experiments with balls rolling down nearly frictionless inclined planes to slow the motion and increase the timing accuracy. Increasingly precise experiments have been performed, such as those performed by Loránd Eötvös , using
27666-408: The use of chariots in battle was obsolete in most nations; despite a few ineffective attempts to revive scythed chariots . The last recorded use of chariots as a shock force in continental Europe was during the Battle of Telamon in 225 BC. However, chariots remained in use for ceremonial purposes such as carrying the victorious general in a Roman triumph , or for racing. Outside of mainland Europe,
27840-441: The utility of cavalry should be underestimated, as its strategic role in scouting, skirmishing, and outpost duties was crucial to the Romans' capability to conduct operations over long distances in hostile or unfamiliar territory. On some occasions Roman cavalry also proved its ability to strike a decisive tactical blow against a weakened or unprepared enemy, such as the final charge at the Battle of Aquilonia . After defeats such as
28014-535: The weight. Robert Hooke had published his concept of gravitational forces in 1674, stating that all celestial bodies have an attraction or gravitating power towards their own centers, and also attract all the other celestial bodies that are within the sphere of their activity. He further stated that gravitational attraction increases by how much nearer the body wrought upon is to its own center. In correspondence with Isaac Newton from 1679 and 1680, Hooke conjectured that gravitational forces might decrease according to
28188-414: The world's arms manufacturers , the top firearms manufacturers are Browning , Remington , Colt , Ruger , Smith & Wesson , Savage , Mossberg (United States), Heckler & Koch , SIG Sauer , Walther (Germany), ČZUB (Czech Republic), Glock , Steyr Arms (Austria), FN Herstal (Belgium), Beretta (Italy), Norinco (China), Rostec , and Kalashnikov (Russia). Former top producers included
28362-485: The worldwide total of civilian-held firearms. This amounts to "120.5 firearms for every 100 residents". The world's armed forces control about 133 million (about 13 percent) of the global total of small arms, of which over 43 percent belong to two countries: the Russian Federation (30.3 million) and China (27.5 million). Law enforcement agencies control about 23 million (about 2 percent) of
28536-610: Was a guest-hostage in Thebes. Thessaly was widely known for producing competent cavalrymen, and later experiences in wars both with and against the Persians taught the Greeks the value of cavalry in skirmishing and pursuit. The Athenian author and soldier Xenophon in particular advocated the creation of a small but well-trained cavalry force; to that end, he wrote several manuals on horsemanship and cavalry operations. The Macedonian kingdom in
28710-467: Was divided into light cavalry and heavy cavalry . The differences were their roles in combat, the size of their mounts, and how much armor was worn by the mount and rider . Heavy cavalry, such as Byzantine cataphracts and knights of the Early Middle Ages in Europe, were used as shock troops, charging the main body of the enemy at the height of a battle; in many cases their actions decided
28884-459: Was first started during the ancient Korean kingdom Gojoseon . Since at least the 3rd century BC, there was influence of northern nomadic peoples and Yemaek peoples on Korean warfare. By roughly the first century BC, the ancient kingdom of Buyeo also had mounted warriors. The cavalry of Goguryeo , one of the Three Kingdoms of Korea , were called Gaemamusa (개마무사, 鎧馬武士), and were renowned as
29058-436: Was however strong in most continental cavalry during peacetime and in these dismounted action continued to be regarded as a secondary function until the outbreak of World War I in 1914. With the development of armored warfare , the heavy cavalry role of decisive shock troops had been taken over by armored units employing medium and heavy tanks , and later main battle tanks . Despite horse-borne cavalry becoming obsolete,
29232-495: Was invented in China in the fourth century BC; it was written by the Song dynasty scholars Zeng Gongliang, Ding Du, and Yang Weide in their book Wujing Zongyao (1044 AD) that massed missile fire by crossbowmen was the most effective defense against enemy cavalry charges. On many occasions the Chinese studied nomadic cavalry tactics and applied the lessons in creating their own potent cavalry forces, while in others they simply recruited
29406-508: Was most dramatically demonstrated in Alexander's conquests of Persia , Bactria , and northwestern India. The cavalry in the early Roman Republic remained the preserve of the wealthy landed class known as the equites —men who could afford the expense of maintaining a horse in addition to arms and armor heavier than those of the common legions . Horses were provided by the Republic and could be withdrawn if neglected or misused, together with
29580-744: Was one designed with a speed and purpose beyond that of infantry tanks and would subsequently develop into the main battle tank . Nonetheless, some cavalry still served during World War II (notably in the Red Army , the Mongolian People's Army , the Royal Italian Army , the Royal Hungarian Army , the Romanian Army , the Polish Land Forces , and German light reconnaissance units within
29754-555: Was recognized early on, but was offset by the difficulty of raising large forces and by the inability of horses (then mostly small) to carry heavy armor . Nonetheless, there are indications that, from the 15th century BC onwards, horseback riding was practiced amongst the military elites of the great states of the ancient Near East, most notably those in Egypt , Assyria , the Hittite Empire , and Mycenaean Greece . Cavalry techniques, and
29928-408: Was reduced, with light cavalry mostly unarmored. Yet many cavalry units still retained cuirasses and helmets for their protective value against sword and bayonet strikes, and the morale boost these provide to the wearers, despite the actual armour giving little protection from firearms . By this time the main difference between light and heavy cavalry was in their training and weight; the former
30102-431: Was regarded as best suited for harassment and reconnaissance, while the latter was considered best for close-order charges. By the start of the 20th century, as total battlefield firepower increased, cavalry increasingly tended to become dragoons in practice, riding mounted between battles, but dismounting to fight as infantry, even though retaining unit names that reflected their older cavalry roles. Military conservatism
30276-570: Was the Battle of Cannae , where he inflicted a catastrophic defeat on the Romans. At about the same time the Romans began to recruit foreign auxiliary cavalry from among Gauls , Iberians , and Numidians , the last being highly valued as mounted skirmishers and scouts (see Numidian cavalry ). Julius Caesar had a high opinion of his escort of Germanic mixed cavalry, giving rise to the Cohortes Equitatae . Early emperors maintained an ala of Batavian cavalry as their personal bodyguards until
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