Close-up of center of platform, and overhead projector display.
Purpose:Demonstrate equilibrium of forces
Description:Forces are applied by hanging arbitrary weights on hangers over pulleys. The ring to which the forces are applied will stabilize symmetrically about the center pin when the forces are in equilibrium. Forces can be applied at arbitrary angles by rotating the pulley arms. The photographs above show details of the center of the force table and the system displayed using an overhead projector.
Note that there are three arms over which weights may be hung, and thus a maximum of three vectors can be summed.