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]
If only an external force can c7;w; x9 9 bae)yfw1e uh)jlpephangde ya 6 imhb96eq+byp1 8:ci3ie the momentum of the center of mass of an object, how can the internal force of an engine accelerate a q:9 6i3+a mehd81 ypeyibbci6car?
参考答案:
The engine does not directly accelerate the car. The engine puts a force on the driving wheels, making them rotate. The wheels then push backwards on the roadway as they spin. The Newton’s $3^{rd}$ law reaction to this force is the forward-pushing of the roadway on the wheels, which accelerates the car. So it is the (external) road surface that accelerates the car.
本题详细解析:
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