The amplitude of a simple pendulum decreases with time. But there is no decrease in the amplitude of a pendulum clock. Why?

The amplitude of a simple pendulum decreases with time. But there is n

1.	The amplitude of a simple pendulum decreases with time. But there is no decrease in the amplitude of a pendulum clock. Why?
Answer» SOLUTION :In the case of simple pendulum amplitude DECREASES because energy is LOST in OVERCOMING AIR resistance, friction etc. In the case of pendulum clock this energy lost is balanced by the energy supplied by the wound spring.