This apparatus allows the students to undertake TWO experiments within ONE apparatus; Work done by a Force in vertical and tangential. The vertical back board contains one experiment on each side, thus allowing student groups to work on each experiment separately.
Work done by a Force (Vertical): The apparatus is a simple lifting mechanism with non-linear characteristics. A suspension cord carrying a loaded trolley at mid span is tensioned by passing the cord over a pulley at one end and down to a weight hanger. As the vertical effort is increased, the tensioned cord will move to a new equilibrium position lifting the loaded trolley. Heights of the load and effort are measured relative to the base. All the pulleys are fitted with ball bearings to minimise friction effects.
Work done by a Force (Tangential): A pivoted arm carrying a Load hanger at its end is restrained by a spring balance at right angles to the arm. The angular position of the arm is indicated by a protractor scale attached to the back board. The effort is the force needed to hold the weighted arm at a particular angle. This can be repeated for several different weights.
