This paper deals with the problem of how to skilfully select spring elastic potential energy zero in applying law of conservation of mechanical energy, and makes some analyses combined with examples.
在应用机械能守恒定律时，如何巧选弹簧弹性势能零点问题进行了探讨，并结合实例进行了分析。
You know, if you want to measure the potential energy of something in a gravitational field, you have to define the zero somewhere, right, because it's arbitrary.
你知道，如果你想测量重力场，中某种东西的势能，你需要，在某处定义一个零点，对吧？
We have defined potential energy 0 to be zero at infinity, and that is why all bound orbits have negative total energy.
我们规定，无限大时,势能为，这就是为什么所有的,规则轨道总能量为负。
I could have chosen it right here and nothing would change other than that I offset the zero point B of my potential energy.
除了会抵消零点，势能什么的，都不会变，但是如果我从A到。
Remember that depending upon how you define your zero level here, you also end up with negative values for potential energy.
记住这个值取决于，你怎么定义0水平，你的得到的势能，也是负值。
If I look at this result — the sum of gravitational potential energy and kinetic energy is conserved - for gravitational force — then it is immediately obvious where we put the zero of kinetic energy.
如果看这个结果-，重力势能与动能之和，在重力作用下，是守恒的-，马上，很明显的发现，动能为0的地方。
And I accidentally mentioned that it 0 was the potential energy that is zero, which is obviously not so.
我无意间提起,这里的势能为，但是很明显并不是。
I could have chosen my zero point of potential energy anywhere I please.
作为重力为0的点，我可以选择这里。
That's exactly right, y0 because then the distance R between here and the y zero is R, so this is the potential energy as a function of angle theta.
它非常正确，因为这样，这里和,的距离是，因此这是势能,关于θ的变化。
It is the distance between atoms corresponding to zero potential energy.
这就是相应于势能为零时的原子间距。
The potential energy surface with zero-point energy correction is drawn.
经过零点能校正后能位面被作了出来。
The first-order derivative equal to zero of total potential energy with respect to the relative shear deformation of shear band leads to the equilibrium condition of elastic rock.
将系统的总势能对相对剪切变形求一阶导数（等于零），得到了弹性岩石的平衡条件。
For a pure scalar potential the zero energy bound state does exist, and the fractional charge does exist.
对于纯标量场，存在零能量束缚态，存在分数电荷。
For a pure scalar potential the zero energy bound state does exist, and the fractional charge does exist.
对于纯标量场，存在零能量束缚态，存在分数电荷。
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