# Formula Undamped Harmonic Oscillator Velocity    Current position    Mass    Spring constant    Amplitude

## Velocity

Unit
Velocity $$v(x)$$ of an undamped harmonic oscillator as a function of its current position $$x$$. For example, its velocity is zero at the maximum deflection $$A$$:$$v(A) ~=~ \sqrt{ \frac{D}{m} \, \left(A^2 - A^2\right) } ~=~ 0$$

## Current position

Unit
Current position of a harmonic oscillator at which it has the velocity $$v(x)$$. For example, it could be the current deflection of the spring on which a mass is attached.

## Mass

Unit
Mass of the harmonic oscillator. For a spring pendulum, it is in good approximation the mass hanging on the spring. In the case of a spring whose mass cannot be neglected, a part of the mass of the spring must also be taken into account in $$m$$ because it also oscillates.

## Spring constant

Unit
Spring constant describes the stiffness of a spring, i.e. how well the spring can be deflected.

## Amplitude

Unit
Maximum deflection of a harmonic oscillator. In the case of a spring pendulum, it is the maximum distance of the mass from the rest position (undeflected mass).