Click to Run

This simulates force applied to a level body, with variable friction, force, and mass.
Courtesy of PHET, University of Colorado Boulder
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Click to Run

This simulates motion from a force applied to a body on a level surface, with variable friction, force, and mass.
Courtesy of PHET, University of Colorado Boulder
(Trouble? Try opening it with Firefox and/or modifying your app security)

Click to Run

This simulates motion from force applied to a body on a ramp, with variable friction, force, and mass.
Courtesy of PHET, University of Colorado Boulder
(Trouble? Try opening it with Firefox and/or modifying your app security)

Check out motion, due to a varying force.

Courtesy of the Wolfram Demonstrations Project
(Trouble? Download and install the Wolfram CDF player here. We use it a lot, and it does some really cool stuff.