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2015-05-20T19:49:03+05:30

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When a pendulum oscillates, it tries to overcome the friction due to air and moves.
During this process, loss of energy in the form heat takes place and gradually, the energy required to oscillate decreases.

Hence, eventually, the oscillations damp and the pendulum stops.

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2015-05-21T09:14:18+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
As a pendulum oscillates, potential energy gets converted into kinetic energy and vice versa. 
If there are no losses in this transaction, then the oscillation would remain forever and ever. 
But as the pendulum has to spend some energy against the air drag, a portion of the total energy is gradually lost as heat to the surroundings. Finally, there wouldn't be any energy for further transaction. As a result, the pendulum comes to rest..
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