For a light rope pulling a block along a horizontal rough surface

PHYSICS · Single correct · CBSE · Physics · Laws of Motion · Laws of Motion

Problem

For a light rope pulling a block along a horizontal rough surface, at what angle

\theta

above the horizontal should the rope be held so that the pulling force required to start motion is minimum? (Coefficient of static friction is

\mu_s

.) (a)

\theta = \sin^{-1}(\mu_s)

(b)

\theta = \tan^{-1}(\mu_s)

(c)

\theta = 45^{\circ}

(d)

\theta = \cot^{-1}(\mu_s)