Question

A particle moves in a vertical plane along the closed path seen in FIGURE Q9.7, starting at A
and eventually returning to its starting point. Is the work done by gravity positive, negative, or
zero? Explain.

Short answer

The work done is Zero.

Step-by-step solution

Given Information

A particle moves in a vertical plane along the closed path seen in FIGURE Q9.7, starting at A
and eventually returning to its starting point.

Explanation

The work done is given by the multiplication of force and displacement in the direction of force.

$W=Fxd.$

In this case displacement $d=0$as it returns to the same point.

So the work done will be

$W=Fx0=0$