This complete set includes an inclined plane with pulley and protractor, a halls carriage, and a standard weight hanger. Used to demonstrate resolution of forces, uniform and accelerated motions, kinetic and potential energies. The wooden inclined board measures 60cm length by 10cm width, and can be set at any angle between 0 and 45 degrees. The two scales on the protractor allow angle measurements to be made directly or by trigonometry. The aluminum wheel and cone bearings on the halls carriage help minimize friction on the inclined plane. The mass of the aluminum weight hanger is 50g. Instruction manual included.