Question

In a mechanical wristwatch,which part works in the same way as a pendulum in a clock?

Answer 1

Pendulum:
A pendulum consists of weight tied to a string.The other end of string is tied to rigid support.
The oscillations of pendulum controls the movements of the hands of clock.
In mechanical wrist watch , we have a balance wheel instead of pendulum. Which controls the movements of hands of clock.

Hence In mechanical Wrist watch Balance wheel works in the same manner as Pendulum in Pendulum clock.