This component is a **linear damper**, which acts as a line
force between frame_a and frame_b. A **force f** is exerted on
the origin of frame_b and with opposite sign on the origin of
frame_a along the line from the origin of frame_a to the origin of
frame_b according to the equation:

`f = d*`

**der**(s);

where "d" is the damping constant, "s" is the distance between the origin of frame_a and origin of frame_b, and "der(s)" is the time derivative of "s".

In the following figure a typical animation is shown where a mass is hanging on a damper.

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Dynamics and Control**

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