Question

With pendulum as an example the low of conservation of energy.

Answer 1

A swinging simple pendulum is an example of conservation of energy.

It is a very simple illustration of the transformation of the potential energy into kinetic energy, and of kinetic energy back into potential energy is given by a swinging pendulum(or an oscillation simple pendulum).

Hope it helps

Answer 2

A swinging simple pendulum is an example of conservation of energy because in this body the energy can either be potential or kinetic, or a mixture of both, but its total energy at any inst ant of time remains the same.