A fantastic game that has an incredible physics physics engine is Kerbal Space Program. At the end of Physics C we do get to play with this game, but I own the game and have had many fun times in it. The premise of the game is you own a space agency on the planet Kerbin (earth). You have to design rockets or planes that can power themselves taking into account of lift and mass of the aircraft. You also have to worry about how the atmosphere will effect the craft including the drag due to air resistance. The game also lets you do gravity assists around any planet, probably using the gravitational force formula. It is a fun game to just mess around in and see how many rockets you can strap to a single capsule. But it can also be very difficult because of the real world physics you have to deal with when trying to land a space craft on the Mun.