5
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
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
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Solution
The correct option is A 120 N
Assuming both the blocks are stationary,
For A :
N=F &
f1−20=0⇒f1=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
Assuming both the blocks are stationary,
For A :
N=F &
f1−20=0⇒f1=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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