the Fermi National Accelerator Laboratory
At this site from Fermilab, you can simulate rolling motion to see how the speed and energy change. You'll roll one ball down an inclined ramp and the other along a horizontal ramp. The best feature is that you can change the angle of the inclined ramp and see what happens.
Fermi National Accelerator Laboratory. Race for Energy. Batavia: Fermi National Accelerator Laboratory, 2003. http://ed.fnal.gov/projects/labyrinth/games/warpspeed/race_for_energy/activity.html (accessed 20 October 2014).
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