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。
Great Britain had large amounts of coal; however, there were not yet efficient means by which to produce mechanical energy or to power machinery.
英国有大量的煤；然而，当时还没有有效的方法来产生机械能或为机器提供动力。
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。
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。
Now I want to return to the conservation of mechanical energy.
现在我想回到，机械能守恒。
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。
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。
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。
I believed in the conservation of mechanical energy and I overlooked the tension.
我相信，机械能守恒定理，我忽略了张力。
There is mechanical energy, MGH comes out in the scoops, and what does he notice?
是有机械能，来自于勺子，他看到什么？
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。
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。
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。
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？
Then we have the conservation - of mechanical energy — the sum of kinetic energy and potential energy.
我们知道，机械能守恒定律-，动能和，势能的总和。
And so you could have used the work-energy theorem or you can use the conservation of mechanical energy.
所以你也可以用，功能定理，或者是机械能，守恒定律。
We were able to apply the conservation of mechanical energy because spring forces are conservative forces.
我们也可以运用，机械能守恒，因为弹力，是恒力。
You see it on the general exams for physics, and it's simply a matter of conservation of mechanical energy.
你会在一般的，物理考试中见到，这只是一个，机械能的问题。
When people open or close a door, the door produces mechanical energy that could be turned into electric energy.
人们开关门时，门所产生的机械能可转化成为电能。
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。
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