A wheel is a circular machine that turns around an axle.
Wheels help people travel and help them move loads of materials.
Wheels turn in one direction, either clockwise or counterclockwise. That means they move in the same direction as the hands on a clock, or in the opposite direction as the hands on a clock.
To learn more about wheels, visit this site:
http://www.factmonster.com/ce6/sci/A0852032.html.
