冲量就是力和它所作用的时间的乘积。
The product of a force and the time during which it acts is called impulse.
如果冲量为零，则动量不变。
刹车器的功能就是通过机械装置吸收火车运动冲量。
The function of the brake is to absorb by motion the momentum of the train.
冲量，动量的改变；火箭方程；随机运动的压力作用点。
Impulse and momentum change; rocket equation; origin of pressure from random motion.
在这个很严重的抖动中，会存在有着冲量，先到一边，然后又到另外一边。
In a severe wobble, there is momentum, first to one side, then the other.
在这个很严重的抖动中，会存在有着冲量，先到一边，然后又到另外一边。
In a severe wobble, there is momentum, first to one side, then the other.
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