Given in the figure are two blocks A and B of weight 20 N and 100 N… | JEE Main 2015

Q10JEE Main 2015Medium

Two-Body Friction

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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Answer: (a)

The system A + B is at rest, so vertically the only upward force on it is the wall's friction on B.
Wall friction $=$ total weight $= 20 + 100$
$= 120$ N, so the answer is (a).

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