This trolley demonstrates that rate of acceleration depends upon the angle of incline. The trolley has two low-friction pulleys to ride along the wire cable fastened to a wall. There are three holes in the trolley for attachments. Weights and brackets are supplied for placing the trolley at any point along the cable. Includes: trolley with 50 mm diameter pulleys; 1.5 m wire cable; attachment kit with hardware; instructions for installation; calculations.