Question

A boy tied a string to one of the ends of a box and started sliding the box on a large circular track. The work done by the force applied by the boy is:

• A. Non- zero
• B. Zero
• C. 4 J
• D. Can't be said

Answer 1

The correct option is A

Non- zero

The boy is sliding the box on a large circular track, so the force applied by the boy on the toy is changing its direction continuously as the boy moves. But, the force is in the direction of motion. Therefore the work done by the force is non-zero.

The value of work done depends on the force and the radius of the track, so it can not be 4 J for every case.