I am going bonkers with boredom. So Post some online games that make clever use of physics (springs, joints, gravity, ragdoll, stuff like that)
Dowenload link near top; scroll down for many more. Big fun.
FunMotion has a cool list of physics games, most of which are of the download variety, but some are playable online. Jay Is Games also keeps track of downloadable and Flash-based online physics games through tags. There’s also a fun physics-based Incredible Machine-type contraption game called Fantastic Contraption.
Odd that you would ask this now. Just earlier this week I was reminiscing about a couple of old DOS games that relied on physics. One was a tank game where you had to enter the angle and power for your projectile to try to kill your opponent while factoring in wind and terrain. The other was a space based combat where there were large objects with gravity fields affecting your torpedo.
A quick google found me this gravity game. Going to continue looking for the tank thing though.
Scorched Earth must be the DOS game – everyone played that game. I loved it. The space version of it sounds like the most excellent Warheads.
Here are some suggestions from the last time this question was asked.
Ok, I think I have now officially seen everything. That site has a wanking game!
This is one I’m doing at the moment. More engineering than Physics, but will definitely kill loads of time. It’s a bit odd at first, but once you get your head round it, very compelling:
http://jogos.hex.com.br/jogo/coconut-run/
Fun until you get a pretty good design, then it gets repetitive. It’ll kill 15 minutes though.
Wow I’m stumped. I can’t see a way of getting the cart to move other than building a ramp, in which case the cart has to be tiny and moves too fast to get any coconuts in it but not fast enough to traverse much of the terrain. 
Here’s a new one: Nitrome’s Icebreaker.
You’re supposed to use the arrow keys to give it speed.
That said, I’d like to kick the developer in the nutsack. There’s no way in design to determine if two pieces are actually connected. You can’t readjust pieces. Once you start, there’s no way to go back to the drawing board with the same design and make minor modifications; you have to start all over from scratch each time.
As for a good physics based game, try armadillo run (at armadillorun.com). There are some clipping issues, and it’s not really 3-d, but it’s worth paying $20 for the full game.
doh! I failed to see that in the instructions for some reason. OK I managed to make a fairly spare design and get it across the track with no loss of coconuts and it still gave me 0%. Although at the end of the track, on the final ramp, it bounces against the screen wall. Maybe there’s some hidden trick there.