Recommended for grades 3 to 8, this set is ideal for introducing students to the concepts of changing force by levers and pulleys, and the notion of mechanical advantage. The manual describes experiments with the three types of levers, single and double pulley systems, and shows the characteristics of each machine. Set contents: 1 Lever with centimeter scale, 1 Base and support rod, 2 Pulleys, 1 Support rod with clamp, 1 Spring scale, 2 Hook collars, 2 Weight hangers, 1 Pulley cord, 1 Slotted weight set, 1 Experiment manual.