A crate is dragged along a horizontal floor for by a constant force that makes an…

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

10\,\text{kg}

crate is dragged along a horizontal floor for

4\,\text{m}

by a constant

50\,\text{N}

force that makes an angle

\theta

above the horizontal. The coefficient of kinetic friction between the crate and the floor is

0.3

and

g = 10\,\text{m}\,\text{s}^{-2}

. For what value of

\theta

is the net work done on the crate zero? (a)

38^{\circ}

(b)

53^{\circ}

(c)

72^{\circ}

(d)

18^{\circ}