Projectile Motion Demonstration


This applet demonstrates projectile motion. Each point traces out the path of a ball falling in a vacuum. Each time the ball hits the ground (the x-axis) the ball's momentum decreases by 20%. This corresponds to a value of .8 for the bounce coefficient, which is reasonable for most real balls.

In this window, there is air resistance or drag. The force on the ball is represented by

F = mg - bv

where g is -9.8 m/s, and b is a positive number that increases with the amount of friction. The friction coefficient b is set to 0.2 in this case, and the bounce coefficient is set to unity, so that all the decrease in height is due to air resistance.

Copyright Robert J. McGrew 1998
Last Modified: 6/15/98
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