Learn about air power and create an alternative fuel car. 1. Learn about potential and kinetic energy 2. Design and build a balloon car 3. Test your balloon-powered car 4. Analyze and share results 5. Brainstorm ways to improve your design When you've earned this badge, you'll know how to engineer a balloon-powered car and understand potential energy, kinetic energy, and jet propulsion Set of 5, new in plastic.