Click on the up and down arrows to change the starting velocities of the spheres and click on them to change the masses of the spheres. Clicking the button on the bottom of the screen will switch the type of collision between elastic and inelastic (see notes for explanation). Click "Start" to watch the spheres collide! A circular green pause button will appear in place of the elastic/inelastic button to stop the spheres but not reset them. Clicking "Stop" will reset the spheres to their original positions.
