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Classical physics

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1074: 774: 1006: 962:, to objects in the macroscopic and astronomical realm, can be well-described (understood) with classical mechanics. Beginning at the atomic level and lower, the laws of classical physics break down and generally do not provide a correct description of nature. Electromagnetic fields and forces can be described well by classical electrodynamics at length scales and field strengths large enough that quantum mechanical effects are negligible. Unlike quantum physics, classical physics is generally characterized by the principle of complete 20: 2195: 787: 969:
From the point of view of classical physics as being non-relativistic physics, the predictions of general and special relativity are significantly different from those of classical theories, particularly concerning the passage of time, the geometry of space, the motion of bodies in free fall, and the
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and higher that appear. These formulas then reduce to the standard definitions of Newtonian kinetic energy and momentum. This is as it should be, for special relativity must agree with Newtonian mechanics at low velocities. Computer modeling has to be as real as possible. Classical physics would
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Computer modeling would use only the energy criteria to determine which theory to use: relativity or quantum theory, when attempting to describe the behavior of an object. A physicist would use a classical model to provide an approximation before more exacting models are applied and those
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case. In order to produce reliable models of the world, one can not use classical physics. It is true that quantum theories consume time and computer resources, and the equations of classical physics could be resorted to in order to provide a quick solution, but such a solution would lack
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In a computer model, there is no need to use the speed of the object if classical physics is excluded. Low-energy objects would be handled by quantum theory and high-energy objects by relativity theory.
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As such, the definition of a classical theory depends on context. Classical physical concepts are often used when modern theories are unnecessarily complex for a particular situation. Most often,
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Computer modeling is essential for quantum and relativistic physics. Classical physics is considered the limit of quantum mechanics for a large number of particles. On the other hand,
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theories that predate modern, more complete, or more widely applicable theories. If a currently accepted theory is considered to be modern, and its introduction represented a major
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propagation of light. Traditionally, light was reconciled with classical mechanics by assuming the existence of a stationary medium through which light propagated, the
1722: 1972: 1509: 1279: 818: 1756: 1631: 407: 1644: 1598: 526: 1705: 38:, then the previous theories, or new theories based on the older paradigm, will often be referred to as belonging to the area of "classical physics". 2015: 1929: 499: 2150: 2076: 1477: 1073: 773: 2071: 2083: 1828: 1795: 2140: 2173: 866:, are those that do not use quantum mechanics. In the context of general and special relativity, classical theories are those that obey 481: 1946: 1843: 1818: 1683: 1673: 1272: 1195: 1167: 1138: 1005: 951:
can be described by classical physics when it satisfies conditions such that the laws of classical physics are approximately valid.
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Wojciech H. Zurek, Decoherence, einselection, and the quantum origins of the classical, Reviews of Modern Physics 2003, 75, 715 or
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Depending on point of view, among the branches of theory sometimes included in classical physics are variably:
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is the speed of light. For velocities much smaller than that of light, one can neglect the terms with
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Today, a computer performs millions of arithmetic operations in seconds to solve a classical
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in general. Modern physics includes quantum theory and relativity, when applicable.
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Classical theory has at least two distinct meanings in physics. In the context of
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A computer model would use quantum theory and relativistic theory only.
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Computer modeling and manual calculation, modern and classic comparison
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Mathematically, classical physics equations are those in which the
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Decoherence and the Transition from Quantum to Classical—Revisited
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Barut, Asim O. (1980) . "Introduction to Classical Mechanics".
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Electrodynamics and Classical Theory of Fields & Particles
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In practice, physical objects ranging from those larger than
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refers to post-1900 physics, which incorporates elements of
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According to the 45:refers to pre-1900 physics, while 14: 2194: 2193: 1072: 995:classical-quantum correspondence 786: 785: 772: 105: 1599:Timeline of physics discoveries 839:of physics that do not use the 942:20th- and 21st-century physics 928:Comparison with modern physics 16:Physics as understood pre-1900 1: 1088:Glossary of classical physics 1049:introduce an error as in the 835:, classical theory refers to 408:Koopman–von Neumann mechanics 476:Non-inertial reference frame 2006:Cosmic microwave background 1563:Quantum information science 403:Appell's equation of motion 273:Inertial frame of reference 2241: 1394:Classical electromagnetism 864:classical electromagnetism 2189: 1113:Elementary Modern Physics 901:Classical electrodynamics 1500:Condensed matter physics 983:correspondence principle 856:classical field theories 566:Rotating reference frame 398:Hamilton–Jacobi equation 2141:Chandrasekhar–Eddington 2067:Golden age of cosmology 1999:On specific discoveries 1947:Lorentz transformations 883:Newton's laws of motion 507:Newton's laws of motion 367:Newton's laws of motion 2072:Medieval Islamic world 1815:Computational physics 1757:Variational principles 1684:Electrical engineering 1584:Nobel Prize in Physics 1446:Relativistic mechanics 1058:calculations proceed. 1026:relativistic mechanics 1010: 534:Simple harmonic motion 447:Euler's laws of motion 241:D'Alembert's principle 124: 24: 2225:Philosophy of physics 2062:Golden age of physics 2057:Copernican Revolution 1589:Philosophy of physics 1233:, 44, pp 36–44 (1991) 1125:Morin, David (2008). 1093:Semiclassical physics 1015:differential equation 1008: 388:Hamiltonian mechanics 206:Statistical mechanics 125: 22: 2165:Relativity priority 2020:Subatomic particles 1980:Loop quantum gravity 1969:Quantum information 1918:Quantum field theory 1718:Gravitational theory 1548:Mathematical physics 611:Angular acceleration 603:Rotational frequency 383:Lagrangian mechanics 376:Analytical mechanics 132:Second law of motion 85: 2129:Scientific disputes 2115:Via Panisperna boys 2016:Gravitational waves 1963:Recent developments 1694:Maxwell's equations 1523:Atmospheric physics 1362:Classical mechanics 1290:branches of physics 1242:Wojciech H. Zurek: 1115:Preface p.iii, 1968 1111:Weidner and Sells, 987:Ehrenfest's theorem 972:luminiferous aether 905:Maxwell's equations 878:Classical mechanics 868:Galilean relativity 848:classical mechanics 463:Harmonic oscillator 441:Equations of motion 76:Classical mechanics 70:Part of a series on 2220:History of physics 2174:General relativity 2169:Special relativity 2110:Oxford Calculators 1937:Special relativity 1856:General relativity 1641:History of physics 1579:History of physics 1247:Los Alamos Science 1160:Dover Publications 1011: 922:nonlinear dynamics 860:general relativity 779:Physics portal 393:Routhian mechanics 268:Frame of reference 120: 25: 2207: 2206: 2181:Transfermium Wars 2100:Harvard Computers 1925:Subatomic physics 1898:Quantum mechanics 1834:Superconductivity 1825:Condensed matter 1654:Classical physics 1607: 1606: 1594:Physics education 1543:Materials science 1510:Interdisciplinary 1468:Quantum mechanics 1227:Wojciech H. Zurek 1036:) appears, where 1022:classic mechanics 846:, which includes 833:quantum mechanics 829: 828: 576:Centrifugal force 571:Centripetal force 527:Euler's equations 512:Relative velocity 288:Moment of inertia 118: 92: 53:quantum mechanics 43:classical physics 28:Classical physics 2232: 2197: 2196: 2120:Women in physics 1872:Nuclear physics 1796:Perpetual motion 1730:Material science 1674:Electromagnetism 1634: 1627: 1620: 1611: 1533:Chemical physics 1473:Particle physics 1399:Classical optics 1282: 1275: 1268: 1259: 1252: 1240: 1234: 1224: 1218: 1216:quant-ph/0105127 1208: 1202: 1201: 1184:Einstein, Albert 1180: 1174: 1173: 1151: 1145: 1144: 1132: 1122: 1116: 1109: 1082: 1077: 1076: 1024:is derived from 821: 814: 807: 794: 789: 788: 781: 777: 776: 682:Johann Bernoulli 677:Daniel Bernoulli 598:Tangential speed 502: 478: 453:Fictitious force 448: 300:Mechanical power 290: 231:Angular momentum 129: 127: 126: 121: 119: 117: 109: 108: 99: 94: 93: 67: 2240: 2239: 2235: 2234: 2233: 2231: 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1769:Spectroscopy 1711:Aerodynamics 1689:Field theory 1653: 1518:Astrophysics 1353: 1332:Experimental 1243: 1238: 1230: 1222: 1206: 1187: 1178: 1158:. New York: 1155: 1149: 1128: 1120: 1112: 1107: 1060: 1056: 1045: 1041: 1037: 1033: 1029: 1019: 1012: 976: 968: 953: 946: 931: 918:chaos theory 872: 854:. Likewise, 841:quantisation 830: 621: / 617: / 615:displacement 613: / 474: / 436:Displacement 374: 365: 359:Formulations 346:Virtual work 286: / 226:Acceleration 219:Fundamentals 46: 42: 40: 27: 26: 2029:Higgs boson 1421:Statistical 1337:Theoretical 1314:Engineering 964:determinism 893:Hamiltonian 757:von Neumann 424:Core topics 2214:Categories 2050:By periods 1868:Geophysics 1840:Cosmology 1538:Geophysics 1528:Biophysics 1372:Analytical 1325:Approaches 1188:Relativity 1099:References 916:Classical 910:Classical 895:formalisms 889:Lagrangian 887:Classical 858:, such as 852:relativity 692:d'Alembert 672:Maupertuis 635:Scientists 517:Rigid body 191:Kinematics 57:relativity 2093:By groups 2077:Astronomy 1913:Molecules 1747:Mechanics 1662:Astronomy 1488:Molecular 1389:Acoustics 1382:Continuum 1377:Celestial 1367:Newtonian 1354:Classical 1297:Divisions 1186:(2004) . 960:molecules 737:Liouville 619:frequency 539:Vibration 256:potential 181:Continuum 176:Celestial 153:Textbooks 2199:Category 2024:timeline 2011:Graphene 1973:timeline 1942:timeline 1930:timeline 1903:timeline 1844:timeline 1829:timeline 1819:timeline 1781:timeline 1752:timeline 1735:timeline 1723:timeline 1706:timeline 1679:timeline 1667:timeline 1645:timeline 1066:See also 844:paradigm 837:theories 792:Category 717:Hamilton 702:Lagrange 697:Clairaut 662:Horrocks 623:velocity 593:Pendulum 581:reactive 553:Rotation 522:dynamics 472:Inertial 458:Friction 341:Velocity 316:Momentum 196:Kinetics 186:Dynamics 164:Branches 148:Timeline 63:Overview 2034:Neutron 1891:Weapons 1876:Fission 1791:Entropy 1572:Related 1456:General 1451:Special 1309:Applied 752:Koopman 712:Poisson 707:Laplace 652:Huygens 647:Galileo 492: ( 431:Damping 284:Inertia 278:Impulse 251:kinetic 201:Statics 171:Applied 143:History 32:physics 1881:Fusion 1786:Energy 1764:Optics 1483:Atomic 1438:Modern 1288:Major 1194:  1166:  1137:  940:or to 790:  742:Appell 727:Cauchy 722:Jacobi 667:Halley 657:Newton 642:Kepler 494:linear 490:Motion 336:Torque 311:Moment 246:Energy 236:Couple 1952:tests 1908:Atoms 1886:Power 1861:tests 1212:arXiv 956:atoms 747:Gibbs 732:Routh 687:Euler 326:Speed 321:Space 263:Force 1409:Wave 1304:Pure 1192:ISBN 1164:ISBN 1135:ISBN 985:and 958:and 920:and 891:and 862:and 850:and 331:Time 294:Mass 55:and 1404:Ray 2216:: 1162:. 947:A 870:. 59:. 1647:) 1643:( 1633:e 1626:t 1619:v 1281:e 1274:t 1267:v 1214:: 1200:. 1172:. 1143:. 1046:c 1042:c 1038:v 1034:c 1032:/ 1030:v 907:) 903:( 820:e 813:t 806:v 496:) 115:t 112:d 106:p 102:d 96:= 91:F

Index


physics
paradigm shift
modern physics
quantum mechanics
relativity
Classical mechanics
Second law of motion
History
Timeline
Textbooks
Applied
Celestial
Continuum
Dynamics
Kinematics
Kinetics
Statics
Statistical mechanics
Acceleration
Angular momentum
Couple
D'Alembert's principle
Energy
kinetic
potential
Force
Frame of reference
Inertial frame of reference
Impulse

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