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Period refers to the time it takes for one complete cycle or revolution of a periodic motion. It is usually represented by "T" and measured in seconds.
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Frequency is the number of cycles or oscillations that occur in a given time period. It is the reciprocal of the period.
Amplitude: Amplitude refers to the maximum displacement or distance from equilibrium in a periodic motion.
Simple harmonic motion is a type of periodic motion where the restoring force is directly proportional to the displacement from equilibrium.