SHM

Equation #6: Simple Harmonic Motion

Every oscillating object can be approximated by an ordinary differential equation(given above), assuming the amplitude of oscillation stays small. In this case, there has to be a force acting on the object keeping it oscillating around a mean position.
For example, if you stretch a spring and let it go(one end of the spring remains fixed), it starts a cycle of compressing and stretching and compressing and stretching. This kind of oscillatory motion is very important in physics and helps us solve many seemingly complicated problems.

Watch a simple demo here: https://www.youtube.com/watch?v=_8PR6kaNUcQ

More details: http://www.acoustics.salford.ac.uk/feschools/waves/shm.php

For more equations in Physics, see Famous equations in Physics

Simple Harmonic Motion
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