A block of mass is placed at rest on a horizontal rough surface with angle of friction

PHYSICS · Single correct · AP · Physics 1: Algebra-based · Force and Translational Dynamics · Force and Translational Dynamics

Problem

A block of mass

m

is placed at rest on a horizontal rough surface with angle of friction

\phi

. The block is pulled with a force

F

at an angle

\theta

with the horizontal. The minimum value of

F

required to move the block is (1)

\frac{mg\sin\phi}{\cos(\theta-\phi)}

(2)

\frac{mg\cos\phi}{\cos(\theta-\phi)}

(3)

mg\tan\phi

(4)

mg\sin\phi