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1·It is like an elastic collision between billiard balls.

就像是台球在，台球桌上发生弹性碰撞。

2·It's a nearly elastic collision and it bounces back from the wall.

它近似于弹性碰撞，它从墙壁反弹。

3·We will deal with that today, and we call that an elastic collision.

我们今天要处理这情况，我们称它为弹性碰撞。

4·Now I want to continue a case whereby I have a completely elastic collision.

我要继续此例，我有一个完全弹性碰撞。

5·I will often call it a completely elastic collision, which is really not necessary.

我常叫它完全弹性碰撞，但其实并不需要这样叫。

6·Here the principles of elastic collision and dynamic transmission are demonstrated.

碰球展品演示的是弹性碰撞和动量传递的原理。

7·And we all know that if it is a nearly elastic collision that it comes back with the same velocity.

我们知道，这几乎是弹性碰撞，它以同样速度回来。

8·I told you I chose the case of - a completely elastic collision — Q and so kinetic energy must be conserved.

我说我选择这个例子，它是完全弹性碰撞-，为0,Q, is, zero——，那么动能必然守恒。

9·And so to a reasonable approximation, you will get an elastic collision, but, of course, there's always air drag.

据合理估计，你得到一个弹性碰撞，但空气阻力总存在。

10·And I take a case whereby - I have a completely elastic collision — 0 that means Q is zero — the kind that we have just discussed.

我采取这个例子，我有个完全弹性碰撞-，意味着Q为-，这是我们刚讨论过的。