机械能占据主导地位，他决定了平衡的位置。
Mechanical energy rules supreme, and that's dictating where equilibrium lies.
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。
Great Britain had large amounts of coal; however, there were not yet efficient means by which to produce mechanical energy or to power machinery.
发电机使机械能转换为电。
仅仅利用机械能概念，它是守恒的。
We only used the concept of mechanical energy, which is conserved.
机械能只有在，力是恒定时才恒定。
And mechanical energy is only conserved if the force is a conservative force.
它紧跟着，机械能，守恒定理而产生。
It follows immediately from the conservation of mechanical energy.
机械能是守恒的，因为重力是守恒力。
Mechanical energy is conserved, because gravity is a conservative force.
我要写下整体的，能量守恒，机械能。
I'm going to write down the conservation of total energy, mechanical energy.
是有机械能，来自于勺子，他看到什么？
There is mechanical energy, MGH comes out in the scoops, and what does he notice?
在这两种情况中，都是机械能起的作用。
让我们试着用机械能，守恒定律解答一下。
所以总机械能，守恒。
热传递能够改变物体的机械能。
要注意，并非所有的机械能都是动能。
发电机将机械能转变成电能。
人们开关门时，门所产生的机械能可转化成为电能。
When people open or close a door, the door produces mechanical energy that could be turned into electric energy.
瀑布是机械能。
所以，风速的微小增加可导致获得的机械能大幅增加。
So, a small increase in wind speed can lead to a big increase in the amount of mechanical energy you can harvest.
所以你也可以用，功能定理，或者是机械能，守恒定律。
And so you could have used the work-energy theorem or you can use the conservation of mechanical energy.
核能也可以转化为热量，能转化为机械能，再转成电力。
Nuclear energy can be converted into heat, and that can be converted into mechanical energy and again into electricity.
还是机械能，守恒。
执行元件：把液压能转换为机械能的各种装置。
Actuator: a device for converting hydraulic energy into 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。
We didn't even talk about it when we did the 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。
You see it on the general exams for physics, and it's simply a matter of conservation of mechanical energy.
发电机发电机是把(旋转)机械能转化为电能的装置。
Generator a generator is a machine which converts rotating mechanical energy into electrical energy.
因此几乎所有登山者，都会携带一种，能把机械能转化为电的装置。
And therefore almost every mountaineer has with him or her a device which converts mechanical energy into electricity.
课堂上我们已经看到,怎样在物体旋转时,将机械能,转化成电能的，演示例子。
We have already seen a demonstration in class whereby we converted mechanical energy when someone was rotating, into electric energy.
课堂上我们已经看到,怎样在物体旋转时,将机械能,转化成电能的，演示例子。
We have already seen a demonstration in class whereby we converted mechanical energy when someone was rotating, into electric energy.
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