Worksheets can be printed out from a browser, or copied and pasted into a word processor for editing. Please send us any worksheets you've created or modified and we'll include them here.
Controls allow the amount of air friction and the density of the balls to be varied.
The simulation can be set to pause automatically when either of the balls hits the ground. A graph records the vertical position, velocity and acceleration of both balls. Arrows on the two balls show the forces on them and their velocities. A graph records the vertical position, velocity and acceleration of both balls.