Newton’s Laws of Motion
Newton’s laws of motionFrom Wikipedia, the free encyclopediaFor other uses, see Laws of motion.Newton’s laws of motion are three physical laws that, together, laid the foundation for classical mechanics. They describe the relationship between a body and the forces acting upon it, and its motion in response to those forces. They have been expressed in several different ways, over nearly three centuries,[1] and can be summarised as follows.First law : When viewed in an inertial reference frame, an object eithers re- mains at rest or continues to move at a constant velocity, unless acted upon by an external force.[2][3]Second law : The vector sum of the external forces F on an object is equal to the mass m of that object multiplied by the acceleration vector a of the object: F = ma.Third law : When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body.The three laws of motion were first compiled by Isaac Newton in his Philosophi Naturalis Principia Mathematica (Mathematical Principles of Natural Philoso- phy), first published in 1687.[4] Newton used them to explain and investigate the motion of many physical objects and systems.[5] For example, in the third volume of the text, Newton showed that these laws of motion, combined with his law of universal gravitation, explained Kepler’s laws of planetary motion.Contents1 Overview 22 Newton’s first law 33 Newton’s second law 43.1 Impulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43.2 Variable-mass systems . . . . . . . . . . . . . . . . . . . . . . . . 54 Newton’s third law 55 History 65.1 Newton’s 1st Law . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
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