动量是质量和瞬时速度的乘积MV
冲量是力和作用在物体上时间的乘积FT
其中动量的改变量等于作用的冲量 FT=△MV
而功是力和作用使物体在其方向上的位移的乘积FS
功有动能定律 FS=△1/2MV(2)
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