施予枪的力将导致枪的动量改变-这就是后座力。
This force on the gun will cause a change in momentum for the gun - that's recoil.
一个重物有很大的动量，也就是说，比如一位高速移动的足球运动员一旦运动起来，就很难改变运动状态。
A heavy object, like a football player moving at a high speed, has a lot of momentum—that is, once he is moving, it is hard to change his state of motion.
每一辆车的动量,都会改变。
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