i got another game called Armadillo Run...it's a 3d game, with the goal to make the ball like armadillo reach the goal place from the start position with the help of suitable materials. You can control the tension's in strings and materials too...and overall, it's really really interesting.
It's available for iPhone, iPad, PC, Mac, and Linux. It's $10, but it really is entertaining. If you're knowledgeable about orbits and how they react, it has a relation to physics. The basic idea behind the game is the laws of motion.
You are controlling this bubble in a closed arena. There are also other little bubbles in the arena. Your objective is to consume all the bubbles. When you consume the bubbles you get larger. You move your bubble by clicking on the screen. Clicking will shoot out a small bubble in the direction you click and you are propelled in the opposite direction. There is also gravity involved, elliptical orbits, and a bunch of other cool stuff.
If you're into Space and space programs in general then I'd highly recommend Kerbal space program, it's a sandbox game with the application of the laws of physics, you can download the demo for free and then decide wheteher to purchase the actual game which once bought you are able to download for free the continuous new versions as it's being heavily developed. The price is $18 usd which is about £12 gbp. Endless fun, extremely addictive and an excellent educational tool for all ages!
This is more of a Chemistry game but still... powdertoy.co.uk
Powder Toy has fluid and powder physics. If you have ever played Powder Game then this is more advanced. It has nuclear fission, fusion, subatomic particles, electric currents, acids, diferent states of matter, photons and more cool stuff.
"Crayon Physics" is kind of a neat concept. You draw objects such as rocks or sticks or ramps, and then they fall under gravity. You are supposed to solve puzzles like getting some object to some destination using hand-drawn levers and weights and so forth.
^The funny thing about Crayon Physics (which the creator admits) is that it is more of a sandbox than a puzzle game. You can do so many things that the puzzles are easy. To be a good puzzle game it would have needed to be very restrictive which would have made it less fun.