gc textbook chapter 8 Rotational Motion (id: 0bb298c1f)

[问答题]
We claim that momentum b7s6l p+uvenut k3 76fandpi1(f/vncl0w 0bt ;da angular momentum are conserved. Yet most moving or rotating objects 1w b/apc;dn00fl(vt i eventually slow down and stop. Explain.

参考答案:
Momentum and angular momentum are conserved for closed systems – systems in which there are no external forces or torques applied to the system.  Probably no macroscopic systems on Earth are truly closed, and so external forces and torques (like those applied by air friction, for example) affect the systems over time.


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