Mechanical energy rules supreme, and that's dictating where equilibrium lies.

机械能占据主导地位，他决定了平衡的位置。

In both cases, mechanical energy results.

在这两种情况中，都是机械能起的作用。

mgh A waterfall is mechanical energy, mgh.

瀑布是机械能。

Let's try the conservation of mechanical energy.

让我们试着用机械能，守恒定律解答一下。

And so the total mechanical energy is conserved.

所以总机械能，守恒。