gc textbook chapter 8 Rotational Motion (id: a78c718ff)

[问答题]
Mammals that depend on bei8+p pgnftcv wxq:4a*8ng able to run fast have s hhj)5ov 6,n7 imf9xlrlender lower legs with flesh and muscle concentrated high, close to the body (Fig. 8–34). On the basis of rotational dynamics, explain why this distribution of masnj79irmxv 6foh,) h5 ls 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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