It's a physics toy that demonstrates angular momentum, potential energy, and kinetic energy.

是个物理学家的玩具可以演示角动量还有动能和势能。

Even before World War Two, scientists had known about the potential energy inside uranium, the heaviest metal in the periodic table a diagram which groups the chemical elements into rows and columns according to their atomic number and symbol.

甚至在第二次世界战之前，科学家们就已经知道铀内部的势能。铀是元素周期表中最的金属，元素周期表是根据原子序数和原子符号将化学元素分成行和列的图表。

When a thing is up at a height, it has stored potential energy.

当物体处于一定高度时，它储存了势能。

Yeah, so it relies a lot on I suppose gravitational potential energy.

对，我认为主要借助于力势能。

And now, we can compute her gravitational potential energy at this piece.

现在，我们可以计算她在这一点上的力势能。

This stores the energy by giving the water extra gravitational potential energy.

水分子多出了额外的力位能， 完成充电的动作。

Due to the intense gravitational field of the black hole, these particles convert their potential energy to kinetic energy as they inch closer to the event horizon.

由于黑洞强的引力场，这些颗粒在一寸寸接近事件视界时，将它们的势能转化成了动能。

Each possesses its own density of chemical potential energy, or caloric value, like for example, 1 gram of carbohydrate contains about 4 calories, while a gram of fat contains about 9 calories.

每一种都有自己的化学势能密度或路里值，例如，一克碳水化合物含有 4 路里，而一克脂肪含有 9 路里。

Anyway, this is all just to say that the change in potential energy is negative F times the change in position.

负的F(力的小)乘以位置变化量有负号是因为 如果你让这个力一直推着你。

For this, we need the kinetic and potential energy for each, and we write them as a function of y and eta.

为此， 我们需要每个的动能和势能，并将它们写为 y 和 eta 的函数。

We have like kinetic energy, we have potential energy, friction.

我们有动能、势能和摩擦力。

The challenge for science was learning how to unleash this potential energy in a controlled way.

科学界面临的挑战是了解如何以一种可控的方式释放这种势能。

The negative comes from the fact that if you let the force push you along your potential energy decreases, while if you fight in opposition to the force your potential energy increases.

你的势能就会降低而当你反抗该力而行 你的势能会增加。

The amazing thing about your complicated, self-healing, blood-guzzling muscle tissues is that they turn chemical potential energy into mechanical energy, or movement, simply by doing two things — contracting and relaxing.

你复杂的，自愈的，耗血的肌肉组织的神奇之处在于它们将化学势能转化为机械能，或运动，仅仅通过做两件事情——收缩和放松。

Instead, renewable energy is used to lift heavy block of concrete up into the air where it becomes potential energy.

相反，可再生能源被用来将沉的混凝土块提升到空中，在那里它变成了势能。

So the change in potential energy over time is the negative of the force times the change in position over time, but change in position over time is velocity!

就是负的力的小乘以一段时间内位置变化量但一段时间内位置变化量就是速度！

Both techniques are betting on potential energy as a solution for storing renewable energy for the grid.

这两种技术都把赌注押在势能上，将其作为为电网储存可再生能源的解决方案。

So potential energy you might kind of remember from high school physics.

你们可能还记得高中物理里的势能。

Basically converting this energy into what's called potential energy.

基本上就是把这个能量转换成所谓的势能。

Which means change in potential energy of an object over time is negative velocity times force.

因此 一段时间内总能量的改变量因此 一段时间内总能量的改变量。