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Message: <blockquote data-quote="AtulaSiriwardane" data-source="post: 5020076" data-attributes="member: 120286">Newton's laws of motion are three <a href="http://en.wikipedia.org/wiki/Physical_law" target="_blank">physical laws</a> that form the basis for <a href="http://en.wikipedia.org/wiki/Classical_mechanics" target="_blank">classical mechanics</a>. They are: <ol style="text-align: center"> <li data-xf-list-type="ol">A <a href="http://en.wikipedia.org/wiki/Physical_body" target="_blank">body</a> at rest stays at rest, and a body in motion stays in motion, unless it is acted on by an external force.</li> <li data-xf-list-type="ol"><a href="http://en.wikipedia.org/wiki/Force" target="_blank">Force</a> equals <a href="http://en.wikipedia.org/wiki/Mass" target="_blank">mass</a> times <a href="http://en.wikipedia.org/wiki/Acceleration" target="_blank">acceleration</a> (F = ma). More generally, force equals the time rate of change of <a href="http://en.wikipedia.org/wiki/Momentum" target="_blank">momentum</a>.</li> <li data-xf-list-type="ol">Whenever a first body exerts a force F on a second body, the second body exerts a force −F on the first body. F and −F are equal in size and opposite in direction.</li> </ol> They describe the relationship between the forces acting on a body to the <a href="http://en.wikipedia.org/wiki/Motion_%28physics%29" target="_blank">motion</a> of the body. They were first compiled by <a href="http://en.wikipedia.org/wiki/Isaac_Newton" target="_blank">Sir Isaac Newton</a> in his work <a href="http://en.wikipedia.org/wiki/Philosophi%C3%A6_Naturalis_Principia_Mathematica" target="_blank">Philosophiæ Naturalis Principia Mathematica</a>, first published on July 5, 1687.<a href="http://en.wikipedia.org/wiki/Newton%27s_laws_of_motion#cite_note-Principia-0" target="_blank">[1]</a> Newton used them to explain and investigate the motion of many physical objects and systems.<a href="http://en.wikipedia.org/wiki/Newton%27s_laws_of_motion#cite_note-Motte-1" target="_blank">[2]</a> For example, in the third volume of the text, Newton showed that these laws of motion, combined with his <a href="http://en.wikipedia.org/wiki/Newton%27s_law_of_universal_gravitation" target="_blank">law of universal gravitation</a>, explained <a href="http://en.wikipedia.org/wiki/Kepler%27s_laws_of_planetary_motion" target="_blank">Kepler's laws of planetary motion</a>. </blockquote>

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