Pool aims to demonstrate elastic collisions between particles (pool balls). Using the principles of conservation of energy and conservation of momentum, the mass of the incident ball is calculated from the recoil angles of the balls and the mass of the target ball.

This section also introduces you to the on-screen facilities available in the package.

"Pop-in" help materials are available by clicking on their titles (e.g. "+ Conservation of Kinetic Energy") or by clicking on the links in the text. Some of these are simple definitions whilst others take you through the derivations of the formulae that describe the physics of the animations. You don't have to follow these links but you should find a full explanation there if you want it!