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Periodic Motion / Oscillation concerns any kind of motion that repeats itself over and over.
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An object undergoing periodic motion always has a stable equilibrium position. When it is perturbed, it is pulled towards equilibrium by a restoring force or torque, overshoots and then cycles back to equilibrium.
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The amplitude of the motion
is the maximum magnitude of displacement from equilibrium. -
A cycle is defined to be one trip from
to and back to . -
The period
is the time to complete one cycle. The frequency is the number of cycles in a unit of time. By definition -
The angular frequency
is defined as