gc textbook chapter 8 Rotational Motion (id: a78c718ff)

[问答题]
Mammals that depend on begp 7vu2z a2f+ f3ng0jsing qsbt +d 8i;9c5g xq6tuep-6a,eyt x3bable to run fast have slender lower legs with flesh and muscle concentrated high, close to the body (Fig. 8–34). On the basis of rotational d3tq uix 9 5pxcgyb ae-q,d6tt6; +8sebynamics, 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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