Physics
Answer
A pendulum clock is a time-measuring instrument that works on the principle of a simple pendulum. It uses a swinging pendulum as its timekeeping element, taking 1 second to swing from one extreme to the other, completing a full oscillation in 2 seconds. Its dial has 12 hour markings, each divided into 5 smaller divisions to show 60 minutes. Three hands—hour, minute, and second—are fixed at the center through gear wheels to indicate the time.