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Home > Classical mechanics

Classical mechanics produces very accurate results within the domain of everyday experience. It is superseded by relativistic mechanics for systems moving at large velocities near the speed of light, quantum mechanics for systems at small distance scales, and relativistic quantum field theory for systems with both properties. Nevertheless, classical mechanics is still very useful, because (i) it is much simpler and easier to apply than these other theories, and (ii) it has a very large range of approximate validity. Classical mechanics can be used to describe the motion of human-sized objects (such as tops and baseballs), many astronomical objects (such as planets and galaxiesThis article is about a celestial body. For alternate meanings see galaxy (disambiguation). Spiral Galaxy ESO 269-57 is about 150 million light-years away and 200,000 light-years across. Stars are almost always found in collections called galaxies togethe), and certain microscopic objects (such as organic moleculeIn science, a molecule is the smallest particle of a pure chemical substance that still retains its chemical composition and properties. A molecule consists of multiple atoms joined by shared pairs of electrons in a covalent bond''. It may consist of atoms.)

Although classical mechanics is roughly compatible with other "classical" theories such as classical electrodynamics and thermodynamicsThermodynamics is the physics of energy, heat, work, entropy and the spontaneity of processes. Thermodynamics is closely related to statistical mechanics from which many thermodynamic relationships can be derived. While dealing with processes in which sys, there are inconsistencies discovered in the late 19th century that can only be resolved by more modern physics. In particular, classical nonrelativistic electrodynamics predicts that the speed of lightCherenkov effect in a "swimming pool" nuclear reactor. The effect is due to electrons moving faster than the speed at which light moves in water. The speed of light (denoted as c reputedly from the Latin celeritas "speed", and also known as Einstein's con is a constant relative to an aether mediumIn the late 19th century the luminiferous aether ("light-bearing aether"), or ether was a substance postulated to be the medium for the propagation of light. Later theories, including Einstein's Theory of Relativity, demonstrated that an aether did not ha, a prediction that is difficult to reconcile with classical mechanics and which led to the development of special relativity. When combined with classical thermodynamics, classical mechanics leads to the Gibbs paradoxIn a simple derivation based on the ideal gas law, the entropy S is not an extensive variable as it must be, leading to an apparent paradox known as the Gibbs' paradox . The difficulty is resolved by letting the particles be indistinguishable. Calculating in which entropyFor other uses of the term entropy see Entropy (disambiguation The thermodynamic entropy ''S often simply called the entropy in the context of chemistry and thermodynamics, is a measure of the amount of energy in a physical system which cannot be used to is not a well-defined quantity and to the ultraviolet catastrophe in which a black body is predicted to emit infinite amounts of energy. The effort at resolving these problems led to the development of quantum mechanics.

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Topics: Classical Mechanics Particle Objects Force Velocity Law Time...

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Classical music eraThe Classical period in Western music occurred in the second half of the 18th century. Although the term classical music is used as a blanket term meaning all kinds of music in a certain tradition, it can also occasionally mean this particular era within Classical guitarA classical guitar also called a Spanish guitar is a musical instrument from the guitar family. The classical guitar is distinguished by a number of features. It is an acoustic instrument. The sound is amplified by a sound box. It has six strings. A few c Classical mechanicsClassical mechanics is a model of the physics of forces acting upon bodies. It is often referred to as Newtonian mechanics after Newton and his laws of motion. Classical mechanics is subdivided into statics (which models objects at rest), kinematics (whic Classical musicThis article is about the broad genre of classical music in the Western musical tradition. For the period of music in the 18th century see Classical music era, for articles on classical music of non-Western cultures, see: List of classical music tradition Classical elementSeveral ancient classical element ideas exist. The Greek version of these ideas persisted throughout the Middle Ages and into the Renaissance, deeply influencing European thought and culture. Classical elements in Greece The Greek classical elements are f Classical liberalismClassical liberalism is a political and economic philosophy, originally founded on the Enlightenment tradition, that tries to circumscribe the limits of political power and to define and support individual rights. A comprehensive discussion of classical l Classical orders Classical education Classical architecture Classical authorities of Babylonia and Assyria Classical Latin Classical Chinese Classical physics Classical conditioning Classical economics