Live interactive physics simulations let you explore the Solar System (orbits, seasons, gravity, tides and satellites), play snooker (on a full size table) and experiment with 'Laws of Motion' simulations (free worksheets provided for pendulum, Newton's cradle, terminal velocity and Galileo's balls - as dropped from the Leaning Tower of Pisa). With real-time visualisation of forces and velocities (as arrows on each object as they interact or are pulled around with the mouse) and scrolling graphs recording what happens, MaterialWorlds gives a real feel for how the physical world works.