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

[问答题]
We claim that momentum and angular momentum are conserved. Yet mqac(n90br asq/ka3cp/m ( w4gr8qq g) ost mv.b)j6a: qncim zttn 62sn1d; oving or rotating ;tz a:d 6bmnicjs qn2) vt6n.1objects 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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