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What is simple harmonic motion?what are its examples?
Simple harmonic motion as “periodic motion in which the restoring force is proportional to the displacement.” Periodic means that the motion repeats at a constant, predictable rate. The part about the restoring force being proportional to the displacement simply means the farther you push something, the harder it pushes back.

When a guitar string is plucked, it moves a certain distance, depending on how hard the guitar player strums. The string returns to its starting point and travels nearly the same distance in the opposite direction. The vibrational energy of the string is dissipated in the form of sound. This causes the distance the string moves, or the amplitude of the vibrations, to decrease gradually. The volume of the sound fades until the string eventually falls silent.
Other example : Simple pendulum


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