Dyson Telescope Game: Not to scientific, but logical (and addictive) http://www.dyson.co.uk/game/playgame.asp

Gravity Tester (link provided by Jonah R-S): Change the gravity, friction and number of things flying around and see what happens.

Lever Game (link provided by Jono Naito):http://www.vectorpark.com/levers.html

Doom Funnel Chasers: (Gravity and orbits): http://www.bigideafun.com/penguins/arcade/doom_funnel/default.htm

Gizmos: there are all sorts of science and math simulations here.  You need to have Shockwave to run the simulations.  Some are more fun than others but most are interesting: www.explorelearning.com.

Brain Teasers:  Here are some brain teaser sites:
http://www.brainbashers.com/
http://www.braingle.com/

Nobel Prize-winning games: These games and simulations are all related to corresponding Nobel Prize-winning discoveries in physics, chemistry, medicine and literature.  Challenging and interesting.  http://nobelprize.org/search/games-simulations.html

Magnetism: Another "get the ball in the hole" game but this one includes attractive and repulsive forces.  Good luck.  http://www.addictinggames.com/magnetism.html

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