Technically the movement of a pendulum doesn’t quite match simple harmonic motion.
However, if the angle theta is small enough, θ~sin(θ)
In fact for angles less than 15 degrees the error will be less than one percent.
Thus a simple pendulum essentially displays SHM (simple harmonic motion).
Such approximations are very useful in certain applications, especially in engineering, where such a small amount of error can be tolerable.
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