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 $F$ such that the system does not slide 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 ........ $N$
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Various forces acting on the system are shown in the figure. For vertical equilibrium of the system,
$\mathrm{f}_{\mathrm{B}}=100 \mathrm{N}+20 \mathrm{N}=120 \mathrm{N}$
i.e., frictional force applied by the wall on the block $B$ is $120 N$
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