gc textbook chapter 8 Rotational Motion (id: a78c718ff)

[问答题]
Mammals that depend on being able to run fast han +o2g2s vfw2,wx +m bp.lct6hve slender lower legs with fleshof.cx62sbw 2w ,v+ +hpmt l2ng/:m.e1iv pkxu7h eo2 x and muscle concentrated high, close to the body (Fig. 8–34). On the basis of rotational dynamics, explain why this distribution of mik/2exoeh1p: 7x uv. 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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