This lesson was done my Nancy Loveless and Jackie Davis at Carver.  Their students worked through the scientific method to learn the effects of friction or the lack of friction in relation to the number of steps and time it takes to complete three laps in their gym.  There are screenshots of the process below as well as the video that was recorded during the experiment.  This is a great collaboration between teachers and content areas.

Friction on Your Feet from Frank Fitzpatrick on Vimeo.