Discover the physics concepts of potential and kinetic energy as you experiment with your spring-powered machines. Easy, snap-together assembly requires no glue. The kit includes step-by-step illustrated instructions. + 3-in-1 engineering kit: build three self-powered models, then wind them up and watch them go! + Learn about potential and kinetic energy and how gears and springs function in different mechanical devices. + Race car drives up to 45 feet. + Robot walks on two legs, up to 20 inches. + Timer counts down from up to 6 minutes. + No batteries or electricity required 3-in-1 engineering kit: Assemble three cool robots, wind them up, and watch them go--no batteries required! The models are powered by a mainspring, the main device found in old-fashioned clocks. Models include a race car that drives up to 60 feet, a robot that walks up to 20 inches, and a countdown timer that counts down up to 6 minutes. Learn about potential and kinetic energy and how gears and springs function in different mechanical devices. Includes a 64-page, full-color manual with clear language, simple step-by-step illustrated instructions, and scientific explanations.
