Magic: The Gathering seems to attract lots of smart guys and smart guys tend to like (or be interested) in physics. I know of three pretty good games that use physics.
Fantastic Contraption - Your goal is very simple, build a machine (usually something like a car or tank) to move the pink piece on the left to the pink area on the right. Great fun and very addicting. I would love to code a game like this.
Crayon Physics Demo - Your goal is to move the ball on the left to the star on the right by drawing with your mouse. In the demo you can only draw squares but in the full version, $20, you can draw any shape. Very simple, but very cute also. Fantastic Contraption is probably a little better but you can play this offline.
IncrediBots - You build your robot out of parts and then you use your robot in order to achieve the goal. This is the most complicated but it seems interesting if you can get past the learning curve.