•        With no counterweight, the elevator falls to the lowest level. Without a counterweight to the elevator, it accelerates down to the ground.

•        With no counterweight, I couldn't lift the elevator up by turning the control pulley.

•        With little counterweight, I couldn't lift the elevator up but I could make it go down.

•        When I added another weight, the elevator would go up very little.

•        I kept adding weights until I could lift the elevator both up and down by using the control pulley.

•        By turning the control pulley clockwise, I apply a pull force on the string that acts on the bottom of the elevator causing it to move down.

•        By turning the control pulley counter- clockwise, I allow the counterweight to apply a pull force on the string at the top of the elevator causing it to move up.

•        The counterweight used for the elevator and the elevator itself, are balanced forces. These forces help control the movement of the elevator.