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Question

Given in the figure are two blocks A and B of weight 20 N and 100 N, respectively. These are being pressed against a wall by a force as shown. If the coefficient of friction between the blocks is 0.1 and between block B and the wall is 0.15, the frictional force applied by the wall on block B is


A
120 N
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B
150 N
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C
100 N
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D
80 N
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Solution

The correct option is A 120 N
Assuming both the blocks are stationary,
For A :

N=F &
f120=0f1=20 N
For B :

f2=f1+100=100+20=120 N

Alternative:

Considering the two blocks as one system and due to equilbrium f=120 N

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