本题目来源于试卷: newnewnewnew，类别为 IB物理学
[问答题]
If you walk along a log 986gp*hui ab ciw:)urc b j/k:floating on a l)vyg i;+vgsr)75cmp: u5 f iphake, why does the log move in the opposite dirrc)i:vg h 5gpm5f+v7y)isu p ;ection?
参考答案:
When you try to walk east, you push on the ground (or on the log in this case) with a westward force. When you push westward on the massive Earth, the Earth moves imperceptibly, but by Newton’s 3rd law there is an eastward force on you, which propels you forward. When walking on the log, the relatively light and unrestricted log is free to move, and so when you push it westward, it moves westward as you move eastward.
本题详细解析:
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