gc textbook chapter 8 Rotational Motion (id: a78c718ff)

[问答题]
Mammals that depend on being able to run fast have q(u8s db+ 7;rmbe*kitju3ki+ slender ls qen** q v7pqm0pt(jn. ovd02ower legs with flesh and muscle concentrated high, close to the body (Fig. 8–34)ten jm ps.pqq*v0n(20q*od7 v. 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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