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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 F 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 F 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 C 120 N
As both the masses are in equilibrium, static friction will be acting on the blocks which can be found from balancing the forces in vertical direction.
Writing force balance in vertical direction for block A,
f1= weight of the block A =20 N
Writing force balance in vertical direction for block B,
f2−f1= weight of the block B =100 N
From these equations, we get the value of f2 (frictional force between the wall and block B) as 120 N
As both the masses are in equilibrium, static friction will be acting on the blocks which can be found from balancing the forces in vertical direction.
Writing force balance in vertical direction for block A,
f1= weight of the block A =20 N
Writing force balance in vertical direction for block B,
f2−f1= weight of the block B =100 N
From these equations, we get the value of f2 (frictional force between the wall and block B) as 120 N
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