two physics simulation :
Pendulum Simple Harmonics:15 pendulum simple harmonic oscillation demonstration. The period of each pendulum is 1 second longer than the previous pendulum.This creates a 60 second cycle where the pendulums move in and out of harmony, creating patterns in the swings.
Rope Bridge:This simulation demonstrates 2D physics with collisions and accelerometer based gravity.Several bouncing balls on the screen will collide with one another and a 25 segment elastic rope which acts as an acceleration dampener.
Have fun playing with it.Oh, and children really like the bouncing balls.