# How Does A Pendulum Clock Work?

View different escapement pieces
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Clocks that use a pendulum base as their time base are known as pendulum clocks. The pendulum clock consists of a pendulum itself at the end of the rod, an escapement to pass energy to the pendulum; this is what keeps it swinging and facilitates the release of energy in an orderly manner. To show the number of rotations of the escapement and the time that has passed, an indicator switch is included as well. In a gravity swing pendulum, the pendulum swings at a designed period which varies according to the square root of its effective length.
However, in a torsion spring pendulum, a wheel-like mass suspended from a vertical strip of spring steel composes the pendulum. The pendulum's rotation winds and unwinds the suspension spring with the energy impulses applied to the top of the spring. Due to these cycles being longer than a gravity pendulum clocks, clocks requiring being wound every 30 or even at 400 day intervals are not uncommon.
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In a pendulum, a mass is attached with a string from one side and it can oscillate about its mean position. A pendulum is suspended vertically with the help of a support. When the pendulum is at rest position, the tension in the string and the weight of the mass cancel the effect of each other. When the mass is displaced from its mean position and then released, pendulum starts vibrating to and fro due to restoring force. The acceleration produced in the pendulum is directly proportional to the angle of displacement.

a= -g/l (theta)

a= acceleration

g= gravitational acceleration

l= length of pendulum

Time period of the pendulum is;

T= 2*pi [l/g]1/2

Moreover, pendulum is an example of simple harmonic motion.
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