# Physics Study Guide/Periodic Motion

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## Springs[edit]

### Hooke's law[edit]

k is the spring constant and x is the displacement (the force is the restoring force)

For this equation to be approximately accurate, x needs to be below the spring's elastic limit. If x is more than the spring's elastic limit, the spring will exhibit "plastic behaviour" meaning that it will not return to its original position.

### Potential energy[edit]

potential energy stored in a compressed recoiled spring

T is the period, m is the mass, and k is the spring constant.