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Laws of Motion

History, Newton's Three Laws

What makes a bird fly? A person run? A judo expert flip a heavier opponent? Earth orbit the Sun? These and any other motions are governed by three deceptively simple laws first stated by Isaac Newton in the seventeenth century. These three laws of motion when coupled with Newton's law of gravity form the basis for explaining both the motions we see on theearth and the motions of the heavenly bodies.

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Science EncyclopediaScience & Philosophy: Laser - Background And History to Linear equation