Always in inelastic collisions do you lose kinetic energy.
在非弹性碰撞中，总是失去动能，能否在一次碰撞中，动能增加？
All right, last time we talked exclusively about completely inelastic collisions.
好，上节课，我们只讲了，完全非弹性碰撞。
Inelastic collisions among photoelectrons rapidly distribute their initially gained energy throughout the region of ionized gas.
光电子之间的非弹性碰撞使它们原来获得的能量在整个电离气体中迅速分配。
And in the case of the completely inelastic collisions that we have seen last time, we lost kinetic energy, which was converted to heat.
在这个例子中，它是完全非弹性碰撞，我们上节课也看到了，我们失去了动能，它可能转化为热量。
It is important to realize that momentum conservation applies even to inelastic collisions, in which the kinetic energy is not conserved.
必须记住，动量守恒甚至对于非弹性碰撞也是成立的，尽管这时动能已不守恒。
And then there is a case of which we have seen several examples last time of inelastic collisions, when you lose kinetic energy, so this is an inelastic collision.
有这样一个例子，这种情况，我们上节课就见过几个，它们是非弹性碰撞，当失去动能时，它是非弹性碰撞。
And then there is a case of which we have seen several examples last time of inelastic collisions, when you lose kinetic energy, so this is an inelastic collision.
有这样一个例子，这种情况，我们上节课就见过几个，它们是非弹性碰撞，当失去动能时，它是非弹性碰撞。
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