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。
So with this in mind, I feel comfortable to pursue my conservation of mechanical energy.
记住这个，我们能够很放心地,使用机械能守恒定理。
We believe in the conservation of mechanical energy.
我们相信,机械能守恒定理。
So this is the conservation of mechanical energy.
因此这是，机械能守恒。
Now I want to return to the conservation of mechanical energy.
现在我想回到，机械能守恒。
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。
So, a small increase in wind speed can lead to a big increase in the amount of mechanical energy you can harvest.
所以，风速的微小增加可导致获得的机械能大幅增加。
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。
mgh A waterfall is mechanical energy, mgh.
瀑布是机械能。
A dynamo transforms mechanical energy into electricity.
发电机使机械能转换为电。
There must be something fundamentally wrong with the conservation of mechanical energy.
肯定有什么，基础性的错误，这个机械能守恒定理。
It follows immediately from the conservation of mechanical energy.
它紧跟着，机械能，守恒定理而产生。
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。
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。
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。
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 so the total mechanical energy is conserved.
所以总机械能，守恒。
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。
LEWIN Shall we try the conservation of mechanical energy Is there anything wrong with that?
大声点。，lewin：，So, speak, up。，我们可以尝试用，机械能守恒定律吗？，这样用有什么问题吗？
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。
A generator transforms mechanical energy into electricity.
发电机将机械能转变成电能。
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。
Notice that not all mechanical energy is kinetic energy.
要注意，并非所有的机械能都是动能。
A dynamo transforms mechanical energy into electricity.
发电机将机械能变为电能。
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。
Heat transfer can change an object's mechanical energy.
热传递能够改变物体的机械能。
The mechanical energy can be changed back into electrical energy by a generator.
利用发电机，可以将机械能再度成电能。
The mechanical energy can be changed back into electrical energy by a generator.
利用发电机，可以将机械能再度成电能。
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