Question

how is periodic movement of a pendulum used in making watches?

Answer 1

Because the hands of watches are made in such a way that they move from period of time

Answer 2

Answer:

A pendulum clock is a clock that uses a pendulum, a swinging weight, as its timekeeping element. The advantage of a pendulum for timekeeping is that it is a harmonic oscillator: it swings back and forth in a precise time interval dependent on its length, and resists swinging at other rates