Question

What is the nature of force involved in winding of the watch?

Answer 1

The nature of force involved in winding of the watch is Conservative Force for the following reasons:
1. Work done is completely Recoverable.
2.Work done does not depend upon path.
3. When only a conservative force acts within system, the Kinetic energy and potential energy can change. However, the mechanical energy[Sum of K.E +P.E] of the system will not change.

Answer 2

Nature of the force is gravitational because work done in this field is zero and total energy remains same.