INTRO
A very common and important type of motion occurring in nature is that which involves oscillations backwards and forwards about some fixed point. For instance, suppose one end of an elastic string is tied to a fixed point and a heavy particle is attached to the other end. If the particle is disturbed vertically from its position of equilibrium, it is found that it oscillates to and fro about this position. Clearly the particle cannot be moving under constant acceleration. It is found that is has an acceleration which is always directed towards the equilibrium position and varies in magnitude as the distance of the particle from that position. This kind of motion occurs frequently in nature and since it is of the type which produces all musical notes, it is called Simple Harmonic Motion(Shortly written as S.H.M). The oscillations of a simple pendulum and the transverse vibrations of a plucked violin string are examples of simple harmonic motion.
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