During the swing of a frictionless pendulum, kinetic energy plus potential energy remains constant.
A body or weight attached to a fixed point that swings back and forth due to the gravitational effect is called a pendulum.
A motionless pendulum is at equilibrium and does not move back and forth until a force is applied to it.
When it is displaced from the center position and is subjected to move sideways under the influence of a restoring force then it accelerates freely from position A to equilibrium position and then to position B and vice versa.
Thus, a pendulum is an example of periodic motion in which K.E and P.E remain constant.
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