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Periods of simple harmonic motion (SHM)

Simple harmonic motion is periodic, which means that it has a fixed period and frequency. However, not all oscillations are periodic.

Non-periodic oscillation refers to oscillation that has either no fixed period or no period at all.

Variable stars undergo oscillations in luminous intensity that are non-periodic. A car moving in a straight line along a road undergoes non-periodic motion.

The mass oscillates left and right in simple harmonic motion
The mass oscillates left and right in simple harmonic motion