Experiment with friction, then take a quiz! http://www.bbc.co.uk/schools/scienceclips/ages/8_9/friction.shtml
Play with friction, but don't crash! http://www.scienceunleashed.ie/Games/scooter.swf
Experiment with energy and friction at an interactive skatepark! http://phet.colorado.edu/en/simulation/energy-skate-park-basics
Try your hand at virtual knee or hip replacement surgery. Experiment with Newton's Laws of Motion! Edheads
Can you mix colors of LIGHT? Remember this is different from mixing pigments. Funbrain
Adjust the color of the bouncing ball and it will jump through the hoop! http://mrl.nyu.edu/~perlin/experiments/colorgame/
Click this link and scroll down to color sections to experiment with light! http://www.olympusmicro.com/primer/lightandcolor/java.html
Here are some other resources that you can't find on the internet: School Library Local Public Library