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law of motion

noun, Physics.
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.
Origin of law of motion
1660-70 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for law of motion
  • Then what would be perceived as a law of motion would be simply a random regularity in the motion of matter.
  • Perhaps this law of motion is part of why it's so startling to see people trip.

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