Question

current attempt in progress
a force f acts on an object undergoing a displacement s, the force being oriented at an angle θ with respect to the displacement. which one of the following correctly describes all of the circumstances under which the work done by the force is zero?
the force is zero, or the displacement is zero.
the force is zero, or the displacement is zero, or the angle is 180°.
the force is zero, or the angle is 90°.
the force is zero, or the displacement is zero, or the angle is 90°.
the displacement is zero, or the angle is 90°.

Explanation:

The work - done formula is $W = Fs\cos\theta$, where $F$ is the force, $s$ is the displacement and $\theta$ is the angle between the force and the displacement. When $F = 0$, $W=0$; when $s = 0$, $W = 0$; when $\theta=90^{\circ}$, $\cos\theta = 0$ and $W = 0$.

Answer:

The force is zero, or the displacement is zero, or the angle is 90°.