本题目来源于试卷: gc textbook chapter 7 Linear Momentum，类别为 通用国际物理
[问答题]
We claim that momentum is con(ax)6:uw l.t najuqu6served, yet most moving obks8qkx6r wb4yc-m32 ojects eventually slow down an3yqw6 sb cm8kkx -o2r4d stop. Explain.
参考答案:
For momentum to be conserved, the system under
analysis must be “closed” – not have any forces on it from outside the
system. A coasting car has air friction
and road friction on it, for example, which are “outside” forces and thus
reduce the momentum of the car. If the
ground and the air were considered part of the system, and their velocities
analyzed, then the momentum of the entire system would be conserved, but not
necessarily the momentum of any single component, like the car.
本题详细解析:
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