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Date Posted: 16:54:29 03/23/00 Thu
Author: 仇耀初老師
Author Host/IP: schoolproxy2.psinet.com.hk / 210.184.16.53
Subject: Re: 牛頓第三定律我好唔未呀?
In reply to: 年糕 's message, "牛頓第三定律我好唔未呀?" on 20:07:52 03/22/00 Wed

F1 and F2 are action and reaction pairs
because F1 = force of man -----> ball
F2 = force of ball-----> man.
then F1 = F2 in magnitude.


Only F1 and F3 are acting on the ball. The ball moves with upward acceleration. Thus, There is upward NET force so as to produce the acceleration.
So, F1 > F3.

The answer is A. F1 = F2 > F3.

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