Kids can find out how mechanisms work with Learning Resourcesâ Simple Machines. Five machines help students develop a deeper understanding of how machines make work easier by offering students the opportunity to construct, examine and explain them. Build a lever, pulley, inclined plane, wedge, and wheel and axle all at the same time. Made up of 63 labeled pieces, this set features four weights (two five gram and two 10 gram) and eight rubber bands, so students can modify machines to explore effort, force, load, motion and distance. Includes activity guide with definitions of physical science terms.