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Physics Links

Physics Demonstration Sites

Demos at Physics Lessons dot com
Lecture Demos Search Engine

Optical Illusions

Optical Illusions and Visual Phenomenon
Sandlot Science Optical Illusions
Cool Optical Illusions
Perceptual Science Group @ MIT
Optics for Kids: Optical Illusions
The Eyeballing Game

Catapult Research Resources

The Sinews of War
3D Simulator of Catapult
(requires Shockwave)
How Stuff Works: Catapults
Ancient Greek Artillery
Medieval Castles-Siege-Weapons.com
Catapults.info
Notes section of Wikipedia's entry
Check the Notes section of Wikipedia's entry for several book references.
Physics of the Trebuchet
Trebuchet.com
Nova's companion site
to their Medieval Siege Episode
Video of Onager re-enactment
How to build Catapults
(more for building ideas than for historical research)
http://www.nzp.com/
Unfortunately the Catapult Museum seems to be down. It was originally available at the URL above.

Remember, anyone can write a website about catapults - that doesn't mean they actually know anything about them. So use more than one source (4 are required) and if you can suppliment online references with book references, even better.