The perfect app for teaching and demonstrating the concept of acceleration, inertia, and Newton's First Law. Through visual demonstrations, you can compare the acceleration due to gravity on all the planets in our solar system using a ball, hammer, and feather. There is a "weight calculator" that can be used to determine your weight for any gravity, including, but not limited to, the planets. And, there is an interactive ice rink that demonstrates inertia and the effects of friction. I plan on introducing updates in the future to make this app even more dynamic.