In both cases, mechanical energy results.
在这两种情况中，都是机械能起的作用。
Mechanical energy has always a cause.
机械化的能量总是有一个原因。
mgh A waterfall is mechanical energy, mgh.
瀑布是机械能。
The move water have mechanical energy.
流动的水拥有机械能。
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。
So this is the conservation of mechanical energy.
因此这是，机械能守恒。
We have also the conservation of mechanical energy.
还是机械能，守恒。
I trust the conservation of mechanical energy 100%.
我百分百相信，机械能守恒。
We believe in the conservation of mechanical energy.
我们相信,机械能守恒定理。
A dynamo transforms mechanical energy into electricity.
发电机使机械能转换为电。
A dynamo transforms mechanical energy into electricity.
发电机将机械能变为电能。
Heat transfer can change an object's mechanical energy.
热传递能够改变物体的机械能。
Notice that not all mechanical energy is kinetic energy.
要注意，并非所有的机械能都是动能。
Now I want to return to the conservation of mechanical energy.
现在我想回到，机械能守恒。
A generator transforms mechanical energy into electricity.
发电机将机械能转变成电能。
A generator transforms mechanical energy into electricity.
发电机把机械能转变成电。
It follows immediately from the conservation of mechanical energy.
它紧跟着，机械能，守恒定理而产生。
We only used the concept of mechanical energy, which is conserved.
仅仅利用机械能概念，它是守恒的。
Heat is thereby converted into mechanical energy of the piston.
热由此转换成活塞的机械能。
An electric motor turns electrical energy into mechanical energy.
电动机把电能转换成机械能。
Mechanical energy is conserved, because gravity is a conservative force.
机械能是守恒的，因为重力是守恒力。
Heat must be mechanical energy if every problem is a mechanical one.
如果每一个问题都是力学问题，那么热必须是机械能。
The mechanical energy can be turned into electrical one by a generator.
利用发电机，可以将机械能转变成电能。
I'm going to write down the conservation of total energy, mechanical energy.
我要写下整体的，能量守恒，机械能。
And mechanical energy is only conserved if the force is a conservative force.
机械能只有在，力是恒定时才恒定。
We didn't even talk about it when we did the conservation of mechanical energy.
我们甚至没有讲过它,当我们运用机械能,守恒定理的时候。
Actuator: a device for converting hydraulic energy into mechanical energy.
执行元件：把液压能转换为机械能的各种装置。
When bent, a piezoelectric material turns that mechanical energy into electricity.
当这种材料被挤压而发生弯曲时，压电材料就能够将挤压它的机械能转化成电能。
By motor is meant a machine changing electrical energy into mechanical energy.
所谓电动机就是把电能转变为机械能的机器。
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