about the simulation... Controls allow the amount of air friction and the density of the balls to be varied.
(Controls; allow; the amount of air friction and the density of the balls to be varied) Context(Controls allow,List([24, 38))):(the amount of air friction and the density of the balls; to be; varied)
Controls allow,List([24, 38))
Controls the amount of air friction and the density of the balls
allow to be
the amount of air friction and the density of the balls to be varied
varied