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1·Of the gravitational potential energy...

重力势能的关系。

2·This is the gravitational potential energy.

这是重力势能。

3·Mhy You see? Mgy is gravitational potential energy.

你们看，是重力势能。

4·Notice the gravitational potential energy goes down.

注意，重力势能，是减小的。

5·Notice that the gravitational potential energy increases.

注意，这里，重力势能是增加的。

6·We call mgy... we give that a name, gravitational potential energy.

我们把mgy叫做。,给它一个名字，重力势能

7·Let me first give you the formal definition of gravitational potential energy.

我先给你一个对于，重力势能的形式定义。

8·So you're using, then, the conversion of gravitational potential energy to kinetic energy.

所以你在利用，重力势能，转换成，动能。

9·So if I make a plot of the gravitational potential energy as a function of y, then I would get a straight line.

因此如果我画一张,重力势能,受y变化的图，那么会得到一条直线。

10·When I'm here, gravitational potential energy ; increases in this way; the gravitational force is in this direction.

重力势能，这样增长,重力;,是在这个方向,当我在这里。