With Physics Discovery, you can build 12 models and then conduct experiments with the models to learn about forces and simple machines. Each model demonstrates a fundamental idea in mechanical physics. For example, you can build a balance scale to learn about lever arms, a freight elevator to learn about pulleys, a bicycle to learn about wheels, a motion picture machine to learn about centripetal and centrifugal forces, and a transmission to learn about gears. Physics Discovery is a smaller, introductory companion to our best-selling Physics Workshop kit. It has different building projects and experiments, but parts that are compatible with those in Physics Workshop and Physics Solar Workshop. This kit includes more than 100 building pieces. The 32-page book offers illustrated instructions for building projects and experiments.