Blocks A and B of masses 2kg and 3kg respectively are placed on a smooth ground. If an external force P of magnitude 10N acts on A as shown, find the force exerted by B on A is
A
6N
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B
3N
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C
9N
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D
1N
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Solution
The correct option is A6N Block A and B as a system, FBD of block A+B is
(Here normal force between A and B is internal so we cannot show it in FBD) there is no vertical motion so the net force on system in vertical direction is zero. In horizontal direction there is an external force 10N so the system will accelerate with acceleration a. a=105=2ms2 FBD of block A is, (Here block A and block B are the separate systems so the normal force N is external, normal force N must be shown in each FBD) 10−N=ma=2×2⟹N=6N FBD of block B is,