PBS
Pbs Learning Media: Lever an Obelisk
Investigate the mechanical advantage of the lever in this interactive activity from the NOVA Web site.
Exploratorium
Exploratorium: Structures Around the World
How does that bridge stay up? What are the forces acting on that column? This site helps students understand how structures can be built by having them build their own. Also provides images of real structures for kids to compare with...
University of Guelph
University of Guelph: Physics Tutorials: What Is Torque?
This site provides an introductory look at torque, the measure of how much a force acting on an object causes that object to rotate. Provides a definition of torque, illustrations, and also a formula to define torque.