Three masses, represented as semicircles, are placed along the [math]x[/math]-axis. You can change each object's mass and location by moving the diamond-shaped point above the semicircle. Also, you can remove the mass by dragging the point below the [math]x[/math]-axis.[br][br]The [b]moment of the system about the origin[/b] is calculated, and is represented visually as a spiral about the origin. The size of the spiral represents the tendency of the system to rotate about the origin in the presence of gravity.[br][br]The [b]center of mass[/b] is indicated with a red [math]\times[/math] on the [math]x[/math]-axis.[br][br]