Recently, I found a science gem through Laura of The Crayon Virtuoso (thanks, Laura!). Science Simulations is a series of physics-based game-like simulations from the University of Colorado at Boulder's Physics Education Technology program. Once you can download these programs, you can modify the conditions of the simulation to see what happens. I especially enjoyed shooting a bowling ball and a buick out of a canon (complete with the "boom" and resulting splat!) in the Projectile Motion simulation. It took a few adjustments, but I finally hit the target. There's also a page with nearly 300 Teacher Ideas and Contributions to accompany the simulations. Have fun!
If you liked this post, you might also like:
--Website of the Week: Knowitall.org
--What's in a bowling ball?
--Website of the Week: TryEngineering.org
[Update: 3/17/09 -- Checked links & added suggested posts]