But rotational motion is also a thing -- and an important one.

但旋转运动也存在，而且很重要。

But the physics of rotational motion isn’t all that different from the physics of translational motion.

但是旋转运动的物理学与平移运动的物理学并没有什么不同。

Torque essentially does the same thing, but for rotational motion.

扭矩基本上做同样的事情， 但它特定于旋转运动。

But for rotational motion, we really want to know the object’s angle -- what we call theta.

但是对于旋转运动， 我们真的想知道物体的角度——我们称之为 theta。

Scroll wheels commonly use either optical rotary  encoders or magnetic rotary position sensors in order to measure rotational motion.

滚轮通常使用光学旋转编码器或磁性旋转位置传感器来测量旋转运动。

And many of the equations you use to describe rotational motion will look really familiar to you.

还有很多我们将用来描述的方程 旋转运动听起来很熟悉。

And, there are times when rotational motion can explain things that sound impossible, but actually are true.

有时旋转运动可以解释一些事情 这似乎不可能，但它是真实的。

And calculating the kinetic energy of rotational motion is pretty easy.

寻找运动中的动能 旋转很容易。因为首先，惯性矩。

Next time, we’ll see how how the logic of rotational motion applies to another idea: momentum!

下一次，我们将看到旋转运动的逻辑如何应用于另一个想法：动量！

But the physics of rotational motion isn't all that different from the physics of translational motion.

但运动的物理学也不例外 非常关于平移运动的物理学。

But when an object is ROTATING, some of its kinetic energy is also taking the form of Rotational Motion.

但是当物体旋转时，它的一些动能 它采取旋转运动的形式。

Because, first, the moment of inertia affects rotational motion in the same way that mass affects translational motion.

它们以相同的方式影响旋转运动 质量影响平移运动。

Next time, we'll see how how the logic of rotational motion applies to another idea: momentum!

下一次，你会看到逻辑是如何应用的 另一个想法的旋转运动：动量！

So, the kinetic energy of an object's rotational motion is just half of its moment of inertia, times its angular velocity squared.

所以物体旋转运动的动能是 惯性矩的一半乘以其角速度的平方。

For now, you learned about the qualities of rotational motion, including angular position, angular velocity, periodic motion, and the special case of rolling without slipping.

现在，您了解了旋转运动的性质，包括角位置、角速度、周期运动，以及滚动不打滑的特殊情况。

One thing to note is that in this video we covered just two methods to measure rotational motion: an  optical encoder and a magnetic position encoder.

需要注意的一点是，在本视频中，我们只介绍了两种测量旋转运动的方法：光学编码器和磁性位置编码器。

I know I just blew your mind, so while you put your head back together, I want to talk about one more basic quality of rotational motion: angular acceleration.

OK：我知道我让你大吃一惊， 所以当你把头放回原处时，我想谈谈旋转运动的一个更基本的特性：角加速度。