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| {{About|inertia in physics}}
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| {{Refimprove|date=April 2013}}
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| {{Classical mechanics|cTopic=Fundamental concepts}}
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| '''Inertia''' is the resistance of any physical object to any change in its state of motion (including a change in direction). In other words, it is the tendency of objects to keep moving in a straight line at constant linear velocity. The principle of inertia is one of the fundamental principles of [[classical physics]] that are used to describe the [[Motion (physics)|motion]] of objects and how they are affected by applied [[forces]]. Inertia comes from the Latin word, ''iners'', meaning idle, sluggish. Inertia is one of the primary manifestations of [[mass]], which is a quantitative property of physical systems. [[Isaac Newton]] defined inertia as his first law in his ''[[Philosophiæ Naturalis Principia Mathematica]]'', which states:<ref>Andrew Motte's English translation:{{Citation
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| | last = Newton
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| | first = Isaac
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| | title = Newton's Principia : the mathematical principles of natural philosophy
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| | publisher = Daniel Adee
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| | year = 1846
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| | location = New York
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| | url = http://www.archive.org/details/newtonspmathema00newtrich
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| | pages= 72
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| }}</ref>
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| {{quote|The ''vis insita'', or innate force of matter, is a power of resisting by which every body, as much as in it lies, endeavours to preserve its present state, whether it be of rest or of moving uniformly forward in a straight line.<!--There is a citation in the text immediately preceding the quote.-->}}
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| In common usage the term "inertia" may refer to an object's "amount of resistance to change in velocity" (which is quantified by its mass), or sometimes to its [[momentum]], depending on the context. The term "inertia" is more properly understood as shorthand for "the principle of inertia" as described by Newton in his [[Newton's laws of motion|First Law of Motion]]: that an object not subject to any net external force moves at a constant velocity. Thus, an object will continue moving at its current [[velocity]] until some force causes its speed or direction to change.
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| On the surface of the Earth inertia is often masked by the effects of [[friction]] and [[Drag (physics)|air resistance]], both of which tend to decrease the speed of moving objects (commonly to the point of rest), and [[Gravitation|gravity]]. This misled classical theorists such as [[Aristotle]], who believed that objects would move only as long as force was applied to them.<ref>Pages 2 to 4, Section 1.1, "Skating", Chapter 1, "Things that Move", Louis Bloomfield, Professor of Physics at the [[University of Virginia]], ''How Everything Works: Making Physics Out of the Ordinary'', John Wiley & Sons (2007), hardcover, ISBN 978-0-471-74817-5</ref>
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| ==History and development of the concept==
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| ===Early understanding of motion===
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| Prior to the [[Renaissance]], the most generally accepted theory of motion in [[Western philosophy]] was based on [[Aristotle]] (around 335 BC to 322 BC) who said that, in the absence of an external motive power, all objects (on Earth) would come to rest and that moving objects only continue to move so long as there is a power inducing them to do so. Aristotle explained the continued motion of projectiles, which are separated from their projector, by the action of the surrounding medium which continues to move the projectile in some way.<ref>Aristotle, ''Physics'', 8.10, 267a1–21; [http://etext.library.adelaide.edu.au/a/aristotle/a8ph/ Aristotle, ''Physics'', trans. by R. P. Hardie and R. K. Gaye].</ref> Aristotle concluded that such violent motion in a void was impossible.<ref>Aristotle, ''Physics'', 4.8, 214b29–215a24.</ref>
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| Despite its general acceptance, Aristotle's concept of motion was disputed on several occasions by notable philosophers over nearly two [[millennia]]. For example [[Lucretius]] (following, presumably, [[Epicurus]]) stated that the 'default state' of matter was motion not stasis.<ref>Lucretius, ''On the Nature of Things'' (London: Penguin, 1988), pp. 60–65</ref> In the 6th century [[John Philoponus]] criticized the inconsistency between Aristotle's discussion of projectiles, where the medium keeps projectiles going, and his discussion of the void, where the medium would hinder a body's motion. Philoponus proposed that motion was not maintained by the action of a surrounding medium but by some property imparted to the object when it was set in motion. Although this was not the modern concept of inertia, for there was still the need for a power to keep a body in motion, it proved a fundamental step in that direction.<ref>{{cite book|last=Sorabji|first=Richard|title=Matter, space and motion : theories in antiquity and their sequel|year=1988|publisher=Cornell University Press|location=Ithaca, N.Y.|isbn=978-0801421945|edition=1st |pages=227—228}}</ref><ref>{{cite encyclopedia |url=http://plato.stanford.edu/entries/philoponus/#2.1 |encyclopedia=Standford Encyclopedia of Philosophy |title=John Philoponus |date=8 June 2007 |accessdate=26 July 2012}}</ref><ref name=Darling_2006>{{Cite book | last = Darling | first = David | title = Gravity's arc: the story of gravity, from Aristotle to Einstein and beyond | publisher = John Wiley and Sons | year = 2006 | pages = 17, 50 | url = http://books.google.com/books?id=Nh3zEV_2N4EC&pg=PA50 | isbn = 978-0-471-71989-2}}</ref> This view was strongly opposed by [[Averroes]] and by many [[Scholasticism|scholastic]] philosophers who supported Aristotle. However this view did not go unchallenged in the [[Islamic Golden Age|Islamic world]], where Philoponus did have several supporters who further developed his ideas.
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| ===Theory of impetus===
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| {{Main|Theory of impetus}}
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| {{See also|Conatus}}
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| In the 14th century, [[Jean Buridan]] rejected the notion that a motion-generating property, which he named ''impetus'', dissipated spontaneously. Buridan's position was that a moving object would be arrested by the resistance of the air and the weight of the body which would oppose its impetus.<ref>Jean Buridan: Quaestiones on Aristotle's Physics (quoted at [http://web.archive.org/web/20110720105959/http://brahms.phy.vanderbilt.edu/a203/impetus_theory.html Impetus Theory])</ref> Buridan also maintained that impetus increased with speed; thus, his initial idea of impetus was similar in many ways to the modern concept of [[momentum]]. Despite the obvious similarities to more modern ideas of inertia, Buridan saw his theory as only a modification to Aristotle's basic philosophy, maintaining many other [[Peripatetic school|peripatetic]] views, including the belief that there was still a fundamental difference between an object in motion and an object at rest. Buridan also believed that impetus could be not only linear, but also circular in nature, causing objects (such as celestial bodies) to move in a circle.
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| Buridan's thought was followed up by his pupil [[Albert of Saxony (philosopher)|Albert of Saxony]] (1316–1390) and the [[Oxford Calculators]], who performed various experiments that further undermined the classical, Aristotelian view. Their work in turn was elaborated by [[Nicole Oresme]] who pioneered the practice of demonstrating laws of motion in the form of graphs.
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| Shortly before Galileo's theory of inertia, [[Giambattista Benedetti]] modified the growing theory of impetus to involve linear motion alone:
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| {{quote|"…[Any] portion of corporeal matter which moves by itself when an impetus has been impressed on it by any external motive force has a natural tendency to move on a rectilinear, not a curved, path."<ref>Giovanni Benedetti, selection from ''Speculationum'', in [[Stillman Drake]] and I. E. Drabkin, ''Mechanics in Sixteenth Century Italy'' [[University of Wisconsin Press]], 1969, p. 156.</ref>}}
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| Benedetti cites the motion of a rock in a sling as an example of the inherent linear motion of objects, forced into circular motion.
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| ===Classical inertia===
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| [[File:Galileo.arp.300pix.jpg|thumb|250px|Galileo Galilei]]
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| The law of inertia states that it is the tendency of an object to resist a change in motion. According to Newton, an object will stay at rest or stay in motion (i.e. 'maintain its velocity' in modern terms) unless acted on by a net external force, whether it results from [[gravity]], [[friction]], contact, or some other source. The Aristotelian division of motion into mundane and celestial became increasingly problematic in the face of the conclusions of [[Nicolaus Copernicus]] in the 16th century, who argued that the earth (and everything on it) was in fact never "at rest", but was actually in constant motion around the sun.<ref>[http://webexhibits.org/calendars/year-text-Copernicus.html Nicholas Copernicus: The Revolutions of the Heavenly Spheres], 1543</ref> [[Galileo]], in his further development of the Copernican model, recognized these problems with the then-accepted nature of motion and, at least partially as a result, included a restatement of Aristotle's description of motion in a void as a basic physical principle:
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| <blockquote>A body moving on a level surface will continue in the same direction at a constant speed unless disturbed.<ref>For a detailed analysis concerning this issue, see Alan Chalmers article "Galliean Relativity and Galileo's Relativity", in ''Correspondence, Invariance and Heuristics: Essays in Hounour of Heinz Post'', eds. Steven French and Harmke Kamminga, Kluwer Academic Publishers, Dordrecht, 1991, ISBN 0792320859.</ref> </blockquote>
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| Galileo writes that 'all external impediments removed, a heavy body on a spherical surface concentric with the earth will maintain itself in that state in which it has been; if placed in movement towards the west (for example), it will maintain itself in that movement'.<ref>Drake, S. ''Discourses and Opinions of Galileo'', Doubleday Anchor, New York, 1957, pp. 113–114</ref> This notion which is termed 'circular inertia' or 'horizontal circular inertia' by historians of science, is a precursor to, but distinct from, Newton's notion of rectilinear inertia.<ref>See Alan Chalmers article "Galliean Relativity and Galileo's Relativity", in ''Correspondence, Invariance and Heuristics: Essays in Hounour of Heinz Post'', eds. Steven French and Harmke Kamminga, Kluwer Academic Publishers, Dordrecht, 1991, pp. 199–200, ISBN 0792320859. Chalmers does not, however, believe that Galileo's physics had a general principle of inertia, circular or otherwise.</ref><ref>Dijksterhuis E.J. ''The Mechanisation of the World Picture'', Oxford University Press, Oxford, 1961, p. 352</ref> For Galileo, a motion is '[[horizontal and vertical|horizontal]]' if it does not carry the moving body towards or away from the centre of the earth, and for him 'a ship, for instance, having once received some impetus through the tranquil sea, would move continually around our globe without ever stopping'.<ref>Galileo, ''Letters on Sunspots'' 1613 quoted in Drake, S. ''Discourses and Opinions of Galileo'', Doubleday Anchor, New York, 1957, pp. 113–114.</ref><ref>According to Newtonian mechanics, if a projectile on a smooth spherical planet is given an initial horizontal impetus, it will not remain on the surface of the earth. Various curves are possible depending on the initial speed and the height of launch. See Harris Benson ''University Physics'', New York 1991, page 268.
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| If constrained to remain on the surface, by being sandwiched, say, in between two concentric spheres, it will follow a great circle on the surface of the earth i.e. will only maintain a westerly direction if fired along the equator. See "Using great circles" [http://www.physics.oregonstate.edu/~mcintyre/COURSES/ph429_S06/slides.pdf Using great circles]</ref>
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| It is also worth noting that Galileo later went on to conclude that based on this initial premise of inertia, it is impossible to tell the difference between a moving object and a stationary one without some outside reference to compare it against.<ref>[http://webexhibits.org/calendars/year-text-Galileo.html Galileo: Dialogue Concerning the Two Chief World Systems], 1631 ([[Dialogue Concerning the Two Chief World Systems|Wikipedia Article]])</ref> This observation ultimately came to be the basis for [[Einstein]] to develop the theory of [[Special Relativity]].
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| Concepts of inertia in Galileo's writings would later come to be refined, modified and codified by [[Isaac Newton]] as the first of his [[Newton's laws of motion|Laws of Motion]] (first published in Newton's work, ''[[Philosophiae Naturalis Principia Mathematica]]'', in 1687):
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| <blockquote>Unless acted upon by a net unbalanced force, an object will maintain a constant velocity.</blockquote>
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| Note that "velocity" in this context is defined as a [[Euclidean vector|vector]], thus Newton's "constant velocity" implies both constant speed and constant direction (and also includes the case of zero speed, or no motion). Since initial publication, Newton's Laws of Motion (and by extension this first law) have come to form the basis for the branch of [[physics]] known as [[classical mechanics]].{{citation needed|date=August 2012}}
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| The actual term "inertia" was first introduced by [[Johannes Kepler]] in his ''Epitome Astronomiae Copernicanae'' (published in three parts from 1618–1621); however, the meaning of Kepler's term (which he derived from the Latin word for "idleness" or "laziness") was not quite the same as its modern interpretation. Kepler defined inertia only in terms of a resistance to movement, once again based on the presumption that rest was a natural state which did not need explanation. It was not until the later work of Galileo and Newton unified rest and motion in one principle that the term "inertia" could be applied to these concepts as it is today.{{citation needed|date=August 2012}}
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| Nevertheless, despite defining the concept so elegantly in his laws of motion, even Newton did not actually use the term "inertia" to refer to his First Law. In fact, Newton originally viewed the phenomenon he described in his First Law of Motion as being caused by "innate forces" inherent in matter, which resisted any acceleration. Given this perspective, and borrowing from Kepler, Newton actually attributed the term "inertia" to mean "the innate force possessed by an object which resists changes in motion"; thus Newton defined "inertia" to mean the cause of the phenomenon, rather than the phenomenon itself. However, Newton's original ideas of "innate resistive force" were ultimately problematic for a variety of reasons, and thus most physicists no longer think in these terms. As no alternate mechanism has been readily accepted, and it is now generally accepted that there may not be one which we can know, the term "inertia" has come to mean simply the phenomenon itself, rather than any inherent mechanism. Thus, ultimately, "inertia" in modern classical physics has come to be a name for the same phenomenon described by Newton's First Law of Motion, and the two concepts are now considered to be equivalent.
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| ===Relativity===
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| [[Albert Einstein]]'s theory of [[Special Relativity]], as proposed in his 1905 paper, "On the Electrodynamics of Moving Bodies," was built on the understanding of inertia and [[inertial reference frames]] developed by Galileo and Newton. While this revolutionary theory did significantly change the meaning of many Newtonian concepts such as [[mass]], [[energy]], and [[distance]], Einstein's concept of inertia remained unchanged from Newton's original meaning (in fact the entire theory was based on Newton's definition of inertia). However, this resulted in a limitation inherent in Special Relativity that the [[principle of relativity]] could only apply to reference frames that were ''inertial'' in nature (meaning when no acceleration was present). In an attempt to address this limitation, Einstein proceeded to develop his [[General Theory of Relativity]] ("The Foundation of the General Theory of Relativity," 1916), which ultimately provided a unified theory for both ''inertial'' and ''noninertial'' (accelerated) reference frames. However, in order to accomplish this, in General Relativity Einstein found it necessary to redefine several fundamental concepts (such as gravity) in terms of a new concept of "curvature" of [[space-time]], instead of the more traditional system of forces understood by Newton.{{citation needed|date=August 2012}}
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| As a result of this redefinition, Einstein also redefined the concept of "inertia" in terms of [[geodesic deviation]] instead, with some subtle but significant additional implications. The result of this is that according to General Relativity, when dealing with very large scales, the traditional Newtonian idea of "inertia" does not actually apply, and cannot necessarily be relied upon. Luckily, for sufficiently small regions of spacetime, the Special Theory can be used, in which inertia still means the same (and works the same) as in the classical model.{{Dubious|date=August 2012}}
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| Another profound, perhaps the most well-known, conclusion of the theory of Special Relativity was that energy and mass are not separate things, but are, in fact, interchangeable. This new relationship, however, also carried with it new implications for the concept of inertia. The logical conclusion of Special Relativity was that if mass exhibits the principle of inertia, then inertia must also apply to energy. This theory, and subsequent experiments confirming some of its conclusions, have also served to radically expand the definition of inertia in some contexts to apply to a much wider context including energy as well as matter.{{citation needed|date=August 2012}}
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| ==Interpretations==
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| ===Mass and inertia===
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| [[Physics]] and [[mathematics]] appear to be less inclined to use the popular concept of inertia as "a tendency to maintain momentum" and instead favor the mathematically useful definition of inertia as the measure of a body's resistance to changes in velocity or simply a body's inertial mass.
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| This was clear in the beginning of the 20th century, when the [[theory of relativity]] was not yet created. Mass, ''m'', denoted something like an amount of substance or quantity of matter. And at the same time mass was the quantitative measure of inertia of a body.
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| The mass of a body determines the momentum <math>p</math> of the body at given velocity <math>v</math>; it is a proportionality factor in the formula:
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| :<math>p = mv</math>
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| The factor ''m'' is referred to as [[inertial mass]].
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| But mass, as related to the 'inertia' of a body, can also be defined by the formula:
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| :<math>F = ma</math>
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| Here, ''F'' is force, ''m'' is inertial mass, and ''a'' is acceleration.
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| By this formula, the greater its mass, the less a body accelerates under given force. Masses <math>m</math> defined by formula (1) and (2) are equal because formula (2) is a consequence of formula (1) if mass does not depend on time and velocity. Thus, "mass is the quantitative or numerical measure of body’s inertia, that is of its resistance to being accelerated".
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| This meaning of a ''body's inertia'' therefore is altered from the popular meaning as "a tendency to maintain momentum" to a description of the measure of how difficult it is to change the velocity of a body. But it is consistent with the fact that motion in one reference frame can disappear in another, so it is the change in velocity that is important.
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| ===Inertial mass===
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| There is no measurable difference between gravitational mass and inertial mass. The gravitational mass is defined by the quantity of gravitational field material a mass possesses, including its energy. The "inertial mass" (relativistic mass) is a function of the acceleration a mass has undergone and its resultant speed. A mass that has been accelerated to speeds close to the speed of light has its "relativistic mass" increased, and that is why the magnetic field strength in particle accelerators must be increased to force the mass's path to curve. In practice, "inertial mass" is normally taken to be "invariant mass" and so is identical to gravitational mass without the energy component.
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| [[Gravitational mass]] is measured by comparing the force of gravity of an unknown mass to the force of [[gravity]] of a known mass. This is typically done with some sort of balance. Equal masses will match on a balance because the gravitational field applies to them equally, producing identical weight. This assumption breaks down near supermassive objects such as black holes and neutron stars due to [[tidal force|tidal effects]]. It also breaks down in weightless environments, because no matter what objects are compared, it will yield a balanced reading.
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| Inertial mass is found by applying a known net force to an unknown mass, measuring the resulting acceleration, and applying Newton's Second Law, '''m = F/a'''. This gives an accurate value for mass, limited only by the accuracy of the measurements. When astronauts need to be measured in the weightlessness of free fall, they actually find their inertial mass in a special chair called a body mass measurement device (BMMD).
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| At high speeds, and especially near the speed of light, inertial mass can be determined by measuring the magnetic field strength and the curvature of the path of an electrically-charged mass such as an electron.
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| No physical difference has been found between gravitational and inertial mass in a given inertial frame. In experimental measurements, the two always agree within the margin of error for the experiment. [[Einstein]] used the fact that gravitational and inertial mass were equal to begin his [[General Theory of Relativity]] in which he postulated that gravitational mass was the same as inertial mass, and that the acceleration of gravity is a result of a 'valley' or slope in the [[space-time continuum]] that masses 'fell down' much as pennies spiral around a hole in the common donation toy at a chain store. [[Dennis Sciama]] later showed that the reaction force produced by the combined gravity of all matter in the universe upon an accelerating object is mathematically equal to the object's inertia [http://physics.fullerton.edu/~jimw/general/inertia/index.htm], but this would only be a workable physical explanation if by some mechanism the gravitational effects operated instantaneously.
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| At high speeds, relativistic mass always exceeds gravitational mass. If the mass is made to travel close to the speed of light, its "inertial mass" (relativistic) as observed from a stationary frame would be very great while its gravitational mass would remain its at its rest value, but the gravitational effect of the extra energy would exactly balance the measured increase in inertial mass.
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| ===Inertial frames===
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| In a location such as a steadily moving railway carriage, a dropped ball (as seen by an observer in the carriage) would behave as it would if it were dropped in a stationary carriage. The ball would simply descend vertically. It is possible to ignore the motion of the carriage by defining it as an [[inertial frame]]. In a moving but non-accelerating frame, the ball behaves normally because the train and its contents continue to move at a constant velocity. Before being dropped, the ball was traveling with the train at the same speed, and the ball's inertia ensured that it continued to move in the same speed and direction as the train, even while dropping. Note that, here, it is inertia which ensured that, not its mass.
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| In an [[inertial frame]] all the observers in uniform (non-accelerating) motion will observe the same laws of physics. However observers in another inertial frame can make a simple, and intuitively obvious, transformation (the [[Galilean transformation]]), to convert their observations. Thus, an observer from outside the moving train could deduce that the dropped ball within the carriage fell vertically downwards.
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| However, in reference frames which are experiencing acceleration ([[non-inertial reference frame]]s), objects appear to be affected by [[fictitious force]]s. For example, if the railway carriage were accelerating, the ball would not fall vertically within the carriage but would appear to an observer to be deflected because the carriage and the ball would not be traveling at the same speed while the ball was falling. Other examples of fictitious forces occur in rotating frames such as the earth. For example, a missile at the North Pole could be aimed directly at a location and fired southwards. An observer would see it apparently deflected away from its target by a force (the [[Coriolis effect|Coriolis force]]) but in reality the southerly target has moved because earth has rotated while the missile is in flight. Because the earth is rotating, a useful inertial frame of reference is defined by the stars, which only move imperceptibly during most observations.The law of inertia is also known as Isaac Newton's first law of motion.
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| In summary, the principle of inertia is intimately linked with the principles of [[conservation of energy]] and [[Momentum#Conservation|conservation of momentum]].
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| ==Source of inertia; fringe theories==
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| Various efforts by notable physicists such as [[Ernst Mach]] (see [[Mach's principle]]), [[Albert Einstein]], [[Dennis William Sciama]], and [[Bernard Haisch]] have been put towards the study and theorizing of Inertia. "An object at rest tends to stay at rest. An object in motion tends to stay in motion."
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| Another physicist, Vern Smalley, has derived the Lorentz transformation for mass by assuming that the gravitational field identified by Einstein is distorted during acceleration. Einstein's assumption was that the field would not be deformed during acceleration, but Smalley explored what happened if it was. He found that during acceleration, the gravitational field of a mass was compressed in the direction of the acceleration and rarefied in the opposite direction. The gravitational field potential of the mass was already propagating at the speed of light, and by forcing the field to move faster, it was resisting the acceleration by resisting compression and rarefaction. This resistance to acceleration is what we call inertia. Throughout the process of acceleration, even up to the speed of light, the total quantity of gravitational field material remains constant, but the shape of the field identifies the inertial mass. <ref>Smalley, ''Deriving Mass Inertia and Time Interval Dilation.''</ref>
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| ==Rotational inertia==
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| Another form of inertia is ''rotational inertia'' (→ [[moment of inertia]]), which refers to the fact that a rotating rigid body maintains its state of uniform [[rotation]]al motion. Its [[angular momentum]] is unchanged, unless an external [[torque]] is applied; this is also called conservation of angular momentum. Rotational inertia depends on the object remaining structurally intact as a rigid body, and also has practical consequences; For example, a [[gyroscope]] uses the property that it resists any change in the axis of rotation.
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| ==See also==
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| *[[General relativity]]
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| *[[Horizontal and vertical]]
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| *[[Inertial guidance system]]
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| *[[Kinetic energy]]
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| *[[List of moments of inertia]]
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| *[[Mach's principle]]
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| *[[Newton's laws of motion]]
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| *[[Newtonian physics]]
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| *[[Special relativity]]
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| *[[Steiner theorem]]
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| ==Notes==
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| {{reflist|35em}}
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| ==References==
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| *{{Cite book
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| |last=Ragep
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| |first=F. Jamil
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| |year=2001a
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| |title=Tusi and Copernicus: The Earth's Motion in Context
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| |journal=Science in Context
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| |volume=14
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| |issue=1–2
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| |pages=145–163
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| |publisher=[[Cambridge University Press]]
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| }}
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| *{{Cite journal
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| |last=Ragep
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| |first=F. Jamil
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| |year=2001b
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| |title=Freeing Astronomy from Philosophy: An Aspect of Islamic Influence on Science
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| |journal=Osiris, 2nd Series
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| |volume=16
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| |issue=Science in Theistic Contexts: Cognitive Dimensions
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| |pages=49–64 & 66–71
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| |bibcode = 2001Osir...16...49R
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| |doi=10.1086/649338}}
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| ==External links==
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| *[http://www.seop.leeds.ac.uk/entries/buridan/ ''Jean Buridan'' Stanford Encyclopaedia of Philosophy]
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| *[http://www.geom.uiuc.edu/education/calc-init/static-beam/mnt-derive.html Inertia Formula]
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| *[http://www.youtube.com/watch?v=TQxeutcYP6I Why Does the Earth Spin? (YouTube)]
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| ==Books and papers==
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| *Butterfield, H (1957) ''The Origins of Modern Science'' ISBN 0-7135-0160-X
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| *Clement, J (1982) "Students' preconceptions in introductory mechanics", ''[[American Journal of Physics]]'' vol 50, pp 66–71
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| *Crombie, A C (1959) ''Medieval and Early Modern Science'', vol 2
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| *McCloskey, M (1983) "Intuitive physics", ''Scientific American'', April, pp 114–123
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| *McCloskey, M & Carmazza, A (1980) "Curvilinear motion in the absence of external forces: naïve beliefs about the motion of objects", ''Science'' vol 210, pp1139–1141
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