Build a balloon hovercraft out of an old CD.
With these Physical Science Projects, you'll be able to discover laws of force and motion for yourself. Experience the force of magnetism, the thrust of pressurized gas, or the power of the sun in hands-on activities like building a balloon rocket car.
Check out our Force & Motion page for more hands-on project ideas with the Physics Workshop or Amazing Bridges kits, fascinating books, and more!
Learn about air density as you make a simple hot air balloon in this easy science project. In its simplest construction, a hot air balloon is comprised of an envelope (the balloon part), a basket, and a fuel source. We'll show you how to construct an envelope from a super-lightweight trash can liner and fuel your balloon with birthday candles.