Natural Frequency

The characteristic angular frequency ωn (or cyclic frequency Fn = ωn/2π) at which a conservative or weakly damped dynamical system oscillates when displaced from equilibrium in the absence of sustained external forcing; for a linear single‑degree‑of‑freedom system ωn = sqrt(k/m). It is a property of the system's mass and stiffness distribution and defines a modal timescale.