Wheels Websites:
How Gears Work
Wheel and Axle
Vehicle Wheel Maintenance
Lever Websites:
Medieval Levers: Wonderville
Balance Lever Gizmo
Levers Websites
Treb Challenge
Catapult Simulator
Simple Machines Websites:
Ed Heads - Simple Machines
Ed Heads - Compound Machines
The Case of the Powerful Pulleys
Dirtmeister's Simple Machines
Inventor's Toolbox
MI Kids Simple Machines
Leonardo's Mystery Machines
Videos:
Torques and Levers
Balloon Cars Video
Ms. Rourke