24ROTATION
In this chapter and the next, we’ll model systems that involve rotating objects. In general, rotation is complicated. In three dimensions, objects can rotate around three axes, and many objects are easier to spin around some axes than others. If the configuration of an object changes over time, it might become easier or harder to spin, which explains the surprising dynamics of gymnasts, divers, ice skaters, and so on. When you apply a twisting force to a rotating object, the effect is often contrary to intuition. For an example, see this video on gyroscopic precession: https://www.youtube.com/watch?v=ty9QSiVC2g0.
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