Simple harmonic motion (SHM) is an area of mechanics that comes up time and again when looking at bodies moving in a regular, repeating fashion, for example a swinging pendulum, a mass oscillating on a spring (see Skillset, pp. 6–9) or an atom vibrating in a solid. The same maths describes all these and many other oscillations.
SHM is defined as the motion of a body when:
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