Two blocks $m$ and $M$ tied together with an inextensible string are placed at rest on a rough horiz

Question

Two blocks $m$ and $M$ tied together with an inextensible string are placed at rest on a rough horizontal surface with coefficient of friction $\mu$. The block $m$ is pulled with a variable force $F$ at a varying angle $	heta$ with the horizontal. The value of $	heta$ at which the least value of $F$ is required to move the blocks is given by

Professor PC Thomas Classes · Answer

Minimum effort is required by pulling a block at the angle of friction.