Car hangs balanced by forces in mid-air over removable inclined plane.

Balanced and Unbalanced Forces. The cart rests about half way up the ramp. Both pulleys are independent of the ramp. The instructor carefully removes the ramp from beneath the truck, and surprise! The truck remains suspended in mid-air. The forces on the truck were balanced independent of the ramp. (The truck is barely in contact with the ramp.) To bring the truck precisely into the reference plane, bend the hook on the top of the cart back and forth across the centroid. Note: if you use the adjustable-angle glass plane, you will have to remove (or at least not use) the attached pulley assembly.