I teach at the elementary level, but this software has to be the best way to introduce physics in a fun and engaging manner. The concept is rather simple. Move the ball from one side to the star. The trick, is you can turn 2-D objects into real life and as they fall the impact of those objects reacts accordingly to the ball.
It's a very fun, and addicting game...plus for this time only, you can download the software for your own price. Yup that's right. You get to choose how much you would like to pay for it. It's really cool, and if you're not sure, there's a free demo that you can play around with to get the hang of it. Check it out here.
How do you see yourself using this with your students?