gc textbook chapter 8 Rotational Motion (id: a78c718ff)

[问答题]
Mammals that depend on being ablp p+dpf* nl,c+xry80ki-6yw ne to run fasg (,1cwt8 r fxfxza;ohykur6::3h9bh t have slender lower legs with flesh and muscleka;,f(wru rz:h9xcbt: 6g3o1f8 xyh h concentrated 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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