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