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

[问答题]
We claim that momentum and angular momentum are conservez0jp jj8 u+x9sd. Yet csv1o09;cwu3c .wn ttq4+el imost moving or rotating objects eventually slow down and stop. c;1 4w9c0cuet owl3v.n tqs+i 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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