Drag a ball. Watch what happens. Next, drag and hold the ball, and wait for some neighbors to be drawn to it. Now let go and watch what happens. Try "throwing" a ball, to give it some initial speed. Press "reset x" to reset the "x" dimension (horizontal). Ditto for y (vertical). Press "N = 1" to reset with one ball. Ditto for 2, 3, 5, 10, 20 and 30. Select "springs" to see where the springs are. Select "color" to make the color of the balls and springs a function of how much kinetic energy (balls) or potential energy (springs) they have (blue is low, red is high). Select "info" to see the scales of the units. Select "energy" to see a running tally of the total energy of the system. If you click it again, it will also break the total energy down into kinetic energy (in the moving balls) plus potential energy (in the stretched springs).
STUFF
