I'm not a physicist, but I love PhysicsGames.net. Well, at least some of the games on there. As always, I prefer games that actually have an ending as opposed to infinitely harder and harder levels.
Nowadays, I generally just Stumble with the category of 'Online Games' when I want to waste some time online.
Though the original idea of loading this site up with games never came to fruition, one letter of my site is an entire game in and of itself. Go check it out!
Back in high school, I wasted many hours at addictinggames.com. They seem to have changed recently, but they always have a bunch of random flash games for you to enjoy.
Did you ever play Duck Hunt? Did you ever want to shoot that annoying dog? Then this retro game is for you!.
Go back to the Fying Pan