Question

A jet plane flies in a vertical circular loop. In what regions of the loop is the work done by the gravitational force acting on the plane is positive?

Answer 1

The work done by the gravitational force acting on the plane is positive at the bottom of the loop and negative at the top of the loop.

Step-by-step explanation:

In a vertical circular loop, the work done by the gravitational force acting on the plane is positive in the regions where the gravitational force is acting in the same direction as the displacement of the plane. This means that the work done by gravity is positive at the bottom of the loop and negative at the top of the loop.

At the bottom of the loop, the gravitational force and displacement are both directed downwards, so the work done by gravity is positive.

At the top of the loop, the gravitational force is directed downwards while the displacement of the plane is directed upwards. Therefore, the work done by gravity is negative at the top of the loop.