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 performing a ,pr94a i0kt0 nei)4qclyh dh(“loop t kw40tl );twya0d adx7rf/t( x;v7tz -the-loop” stunt in which it moves in a vertical circular path as shown in the di )7 /twd4r ;xad7tk a0; w tt0vylt(xfzagram.
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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