Bill Nye explains the concept of simple machines in this episode of the Bill Nye the Science Guy series. To demonstrate how man has devised methods for making work easier, he climbs aboard a roller coaster and takes his bike to the "Tour du Science." To his explanations of pulleys, levers, ramps, wedges, wheels, and screws he inserts his trademark humor and parody to create a fun learning atmosphere.
Disney Educational - Bill Nye The Science Guy: Simple Machines