A block of mass m lies on a rough surface of coefficient of friction mu .A force of F is applied on it at an angle theeta to the horizontal and the block is at rest . The frictional force acting on block is
Since the block is at rest, it means that the opposite horizontal forces are equal.
Hence,
Fcosx - f = ma
Fcosx- f = m×0
Fcosx - f = 0
Fcosx= f.
Answer
