Velocity dependent frictional force

Drag the mass on the end of the spring and observe the motion. Click on the links at the bottom of the page to graph different quantities (velocity, kinetic energy, position, or potential energy).
If you RIGHT-CLICK on the graph, you'll get a popup "snapshot" of the current graph - can be used to compare periods between the various graphs.

Apply no friction : KE graph vx graph x graph PE graph E Total
Apply a velocity-dependent : KE graph vx graph x graph PE graph E Total
Apply a constant frictional force : KE graph vx graph x graph PE graph E Total

Credits : Author : unknown. Modified extensively by Scott Schneider