Precision-made wooden models demonstrate basic principles of work, force, and energy. Through hands-on exploration, students learn how machines can change the direction of a force, reduce work, or turn potential energy into kinetic energy. Includes models Block and Tackle, Screw, Fulcrum Balance, Inclined Plane/Cart, Pulley, Motion Converter, Lever, Wheel and Axle, Gear Rack, Gear Train and Pendulum. Part No.: 511.