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Old Sep 6th 2016, 01:23 AM   #1
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Newton's Third Law textbook problem

Imagine that I am pushing on a wall. Then my textbook says that by Newton's third law, F A B = F B A FAB=FBA, where I am B and the wall is A. Isn't this wrong? Shouldn't it be that F A B = − F B A FAB=−FBA?
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Old Sep 6th 2016, 12:58 PM   #2
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I believe they are talking about the magnitudes of the forces F_AB and F_BA. Per newton's 3rd law the forces are equal in magnitude and opposite in direction. So you are correct if F_AB and F_BA are vectors, not scalars.
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