gc textbook chapter 8 Rotational Motion (id: a78c718ff)

[问答题]
Mammals that depend on being able to run fast have slen) bw zk)w p;v izs5f9h*5 h 1h.qkejr)s,pzlc.der lower legs wiw,f .zwid7) +e(aji jlrmz*;uth flesh and muscle conwa ;z ijfed)w.l*+z, ru7i(jmcentrated high, close to the body (Fig. 8–34). On the basis of rotational dynamics, explain why this distribution of mass is advantageous.

参考答案:

The legs have a lower moment of inertia when the leg mass is concentrated next to the body.  That means the legs will require less torque to have a given angular acceleration, or, alternatively, a higher angular acceleration can be developed.  Thus the animal can run fast.

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