A constant force of produces a displacement of in an object

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

Problem

A constant force of

5\,\text{N}

produces a displacement of

2\,\text{m}

in an object. The angle

\theta

between the force and the displacement is different in four separate trials. Trial I:

\theta = 0^\circ

Trial II:

\theta = 45^\circ

Trial III:

\theta = 90^\circ

Trial IV:

\theta = 180^\circ

In which trial is the work done by the force zero? (a) Trial IV (b) Trial III (c) Trial I (d) Trial II