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Paint Effects > Brush Animation > Make Brush Spring

This lets you add springs to strokes with tubes to give the tubes reactive, interconnected motion. By animating the movement of the surface with the springed tubes on it, the tubes will react appropriately.

Paint Effects > Brush Animation > Make Brush Spring >

These are the options in the Make Brush Spring Options window.

Spring Stiffness: Defines the rigidity of the brush spring. If you increase the stiffness too much, the brush spring might stretch and contract excessively.
Spring Damp: Defines a damping value to mute the spring action. A high value causes the spring length to change more slowly. A low value causes the length to change quickly.
Spring Travel: Defines how far the stroke tubes can swing.
Start Frame: Sets the frame in which the spring behavior begins.