Newton’s laws of motion pl n 1. (General Physics) three laws of mechanics describing the motion of a body. The first law states that abody remains at rest or in uniform motion in a straight line unless acted upon by a force. The second lawstates that a body’s rate of change of momentum is proportional to the force causing it. The third lawstates that when a force acts on a body due to another body, then an equal and opposite force actssimultaneously on that body Collins English Dictionary – Complete and Unabridged © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003
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