# Formula Sinusoidally Forced, Damped Oscillator Phase angle    Mass    Damping constant    Natural frequency    Anregungsfrequenz

## Phase angle

Unit
Phase constant $$\varphi_0$$ of sinusoidally forced damped oscillation indicates the displacement $$y(t)$$ at time $$t=0$$:$$y(0) ~=~ A_0 \, \cos(\varphi_0)$$

## Mass

Unit
Mass of the forced, damped oscillator. For a spring pendulum, it is, to a good approximation, the mass attached to the spring.

## Damping constant

Unit
The damping constant is a measure of how fast the oscillations decay. Depending on the value of the damping constant, we get a underdamped, critically damped or overdamped oscillator.

## Natural frequency

Unit
Frequency at which the oscillator oscillates when it is made to oscillate once.

## Anregungsfrequenz

Unit
Excitation frequency of an external sinusoidal force:$$F_{\text{ext}} ~=~ F_0 \, \cos(\omega\,t)$$