Question

the use of the pendulum​

Answer 1

Answer:

to use it as locket!

Explanation:

thanks for points and good night

Answer 2

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.