How can a pendulum swing in air
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A pendulum is an object hung from a fixed point that swings back and forth under the action of gravity. ... The swing continues moving back and forth without any extra outside help until friction (between the air and the swing and between the chains and the attachment points) slows it down and eventually stops it.
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Pendulum can swing in air.
But it's oscillation gets damped after sometime and amplitude of oscillation becomes infenitisemally small. This happends due to loss of energy to air friction.
In vaccum pendulum undergoes SHM upto infinite times.
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