| 单词 | Newton's laws of motion |
| 释义 | Newton's laws of motion The three laws of motion on which Newtonian mechanics is based. (1) A body continues in a state of rest or uniform motion in a straight line unless it is acted upon by external forces. (2) The rate of change of momentum of a moving body is proportional to and in the same direction as the force acting on it, i.e. F = d(mv)/dt , where F is the applied force, v is the velocity of the body, and m its mass. If the mass remains constant, F = mdv/dt or F = ma , where a is the acceleration. (3) If one body exerts a force on another, there is an equal and opposite force, called a reaction, exerted on the first body by the second |
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