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

[问答题]
We claim that momentulq+fz tc45-pl us/.s;k5 lucf x+vo4h3dse+ im+fz5gm and angular momentum are conserved. Yet most moving or rotating objects eventu+/+5 .d e+hzml4 vx3cufugk5fss i;o sally 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.


本题详细解析: 暂无