law of motion

law of motion
any of three laws of classical mechanics, either the law that a body remains at rest or in motion with a constant velocity unless an external force acts on the body (first law of motion), the law that the sum of the forces acting on a body is equal to the product of the mass of the body and the acceleration produced by the forces, with motion in the direction of the resultant of the forces (second law of motion), or the law that for every force acting on a body, the body exerts a force having equal magnitude and the opposite direction along the same line of action as the original force (third law of motion or law of action and reaction). Also called Newton's law of motion.
[1660-70]

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Universalium. 2010.

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  • first law of motion — noun a body remains at rest or in motion with a constant velocity unless acted upon by an external force • Syn: ↑Newton s first law of motion, ↑Newton s first law • Hypernyms: ↑Newton s law of motion, ↑Newton s law, ↑law of motion * * * Physics.… …   Useful english dictionary

  • Newton's first law of motion — noun a body remains at rest or in motion with a constant velocity unless acted upon by an external force • Syn: ↑first law of motion, ↑Newton s first law • Hypernyms: ↑Newton s law of motion, ↑Newton s law, ↑law of motion * * * Usage: usually …   Useful english dictionary

  • Newton's third law of motion — noun action and reaction are equal and opposite • Syn: ↑third law of motion, ↑Newton s third law, ↑law of action and reaction • Hypernyms: ↑Newton s law of motion, ↑Newton s law, ↑law of motion * * * …   Useful english dictionary

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