本题目来源于试卷: gc physics textbook chapter 4 problems，类别为 通用国际物理
[问答题]
Why does a child in g+ vg c1* fr+ngv)tur4q;t+ h.7vsp sga wagon seem to fall backward when you give the wagon a sharp hvqs.+;s p7tgpull forward?
参考答案: The child tends to remain at rest (Newton’s 1st Law), unless a force acts on her. The force is applied to the wagon, not the child, and so the wagon accelerates out from under the child, making it look like the child falls backwards relative to the wagon. If the child is standing in the wagon, the force of friction between the child and the bottom of the wagon will produce an acceleration of the feet, pulling the feet out from under the child, also making the child fall backwards.
本题详细解析:
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