my pre-test has a question: "A man is standing on a balance scale which reads 80kg. Suddenly, he quats with a n acceleration a (downward). What weight does the scale read while the man is squatting? (A)the same (B) more than 80kg (c) less than 80kg I chosed (b) because before we have N=mg then after the man squatting N=m(g+a) so the scale has to read more than 80kg. But then one of my friend said that N=m(g-a). I'm just confused. Can smbd help me ? I have a bet with him ( 10 bucks, hehe).