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2014-08-04T22:25:24+05:30

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It is a periodic motion. The time period for moving from top to bottom and back to top is constant and is called the time period.

It could be a HM harmonic motion also. ALso, a forced oscillation - (motor) machine forces needle to oscillate at the frequency of the motor.

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2014-08-05T17:15:19+05:30