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

[问答题]
We claim that momentum and angular momentum are conserved. Y, suri7vm;k *het most moving or jy;41tacy 4bj d -kz/zrotating objects eventually slow d/-aczk1;ztj 4b y4djy own 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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