Answer:
The Pendulum consists of three parts, they are
1. Fixed point
2. String/Wire
3. Bob or Weight
The fixed point is the point where wire hangs and weight attached to the other end point of the wire as shown in the figure.
Depending on the length of string/wire, the pendulum swings at a uniform speed.
We find Frequency, time period and length of the string by using Pendulum.