gc textbook chapter 8 Rotational Motion (id: a78c718ff)

[问答题]
Mammals that depend on being able to ke2p/- -xoxd *0fnyxu ai) py;run fast have slender lox73sqb zj.cy0wer legs with flesh and muscle concentrated high, close to the body (Fig. 8–34). On the basis of rotational dynamics, explain why this distri cx.qzy 730sjbbution 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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