三 转动动能 (The kinetic energy of rotation) 解,拉力 FT 对圆盘做功,由刚体绕定轴转动的动能定理可得,拉力 FT的力矩所作的功为 o .
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So we now have a way of calculating the kinetic energy of rotation provided that we know how to calculate the moment of inertia.
现在我们有一个计算，旋转动能的方法，如果我们知道，怎样计算转动惯量。
The motion of a rigid body can be divided into two types: translation and rotation, so the kinetic energy of rigid body is made up of translational energy and rotational energy.
刚体的运动分为平动和转动，那么刚体的动能也就包括平动动能和转动动能。
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