本题目来源于试卷: Space Time & Motion A.2 Forces & Momentum，类别为 IB物理学
[单选题]
A jet aircraft is performin /m6obn5k9 md*aibr r.z vsiz646 sv9s g a v 0x0j(epiz9 ;kjdug5*g.p+ euctvi7 “loop-the-loop” stunt in which it moves in a vertical circular path 9z gg(*x jkv+ .p0t0jdu7vi5ei upce;as shown in the diagram.
Which of the following represents the free body diagram of the pilot at the top of the loop?
A.
B.
C.
D.
参考答案: D
本题详细解析:
Explanation:
There are two forces acting on the pilot which are the gravitational force (weight) and the normal force of the pilot's chair.v The normal force always acts from the chair onto the person. At the top of the loop, this will act vertically downwards. The weight is always vertically downwards.
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