| 单词 | force |
| 释义 | force Symbol F. The agency that tends to change the momentum of a massive body, defined as being proportional to the rate of increase of momentum. For a body of mass m travelling at a velocity v, the momentum is mv. In any coherent system of units the force is therefore given by F = d(mv)/dt . If the mass is constant F = mdv/dt = ma , where a is the acceleration (see Newton's laws of motion). The SI unit of force is the newton. Forces occur always in equal and opposite action-reaction pairs between bodies, though it is often convenient to think of one body being in a force field |
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