"A hands-on approach introduces young scientists to wheels and axles. Science theory and practical, fun projects teach the physics and the technology behind this simple machine. Important science curriculum is explained through historical and contemporary examples of wheels and axles. Step-by-step projects range from the simple to the more challenging."-- Provided by publisher.

What are wheels and axles? -- How wheels and axles work -- Wheels and axles in history -- Moving on wheels -- Changing force and motion -- Lifting with a wheel and axle -- Gear wheels -- Making gear wheels -- Wheels and axles in complex machines -- Facts and fun.