BVG8Science - John's page on the wheel and axle

The wheel and axle is a more complex lever. A wheel can go more than 360 degrees around and a lever can't. An example of a wheel and axle would be a screw driver. When you use a screw driver to tighten a screw, the hand of the screw driver is the wheel and the shaft is axle. Other examples of the wheel and axle are doorknobs, pedals, and the wheels on a car.