In figure, two blocks $M$ and $m$ are tied together with an inextensible and light string. The mass $M$ is placed on a rough horizontal surface with coefficient of friction $\mu$ and the mass $m$ is hanging vertically against a smooth vertical wall. The pulley is frictionless. Choose the correct statement $(s)$
Difficult
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The friction force on the mass $M$ due to rough surface is $f=\mu M g$
In equilibrium,
For mass $m$
$T=m g$
for mass $M$
$f=\mu M g=T \Rightarrow$
$m g=\mu M g \Rightarrow m=\mu M$
If $m g>\mu M g,$ then there would be an acceleration.
Thus, we get $m>\mu M$
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