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Rolling is combined rotation and translation.
How is it described mathematically?
滚动是旋转和翻译的结合。它如何用数学方法描述？
What is the expression for kinetic energy
for a rolling object?
滚动物体的动能表达式是什么？
How is torque expressed as a vector? How
do you get the direction?
力矩如何表示为矢量？如何确定其方向？
What is angular momentum? How does
conservation of angular momentum apply
to a rotating system?
角动量是什么？角动量守恒定律如何应用于旋转系统？
If you sit on a stool which can rotate and hold
a wheel which is rotating, you can cause yourself
and the stool to rotate by turning the wheel over. Explain.
如果你坐在一个可以旋转且能固定轮子的 stool 上，并且该轮子在旋转，你可以通过翻转轮子使自己和 stool 旋转。解释这一现象。
What is torque? How can you increase the torque
on a wrench to turn a stubborn bolt?
力矩是什么？如何增加 wrench 上的力矩以松动顽固的螺栓？
What is required for equilibrium of a large object?
大物体平衡需要什么？
Why do you pick up a long board at it's center? Why
is it difficult to lift it by one end alone?
为什么你会把长板举在中间？为什么单独从一端提起会很难？
Why does a skater spin faster if they pull their legs
and arms in?
为什么花样滑冰运动员在收拢四肢时会转得更快？
What is the difference between centrifugal force
and centripetal force? Which can you measure
with a scale?
向心力和离心力有什么区别？哪一个可以用天平测量？
What is "Newton's second law for rotation"?
什么是‘牛顿第二定律（旋转）’？
How is the parallel axis theorem useful?
平行轴定理有什么用？
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