The wheel and axle is a simple machine. A wheel and axle is a modified lever of the first class that rotates in a circle around a center point or fulcrum. The larger wheel (or outside) rotates around the smaller wheel (axle). Bicycle wheels, ferris wheels, and gears are all examples of a wheel and axle. Wheels can also have a solid shaft with the center core as the axle such as a screwdriver or drill bit or the log in a log rolling contest.
The traditional form as recognized in 19th century textbooks is as shown in the image. This also shows one of the most widely recognized applications, i.e., lifting water from a well. The form consists of a wheel that turns an axle, which turns a rope, which converts the rotational motion to linear motion for the purpose of lifting.
By considering the machine as a torque multiplier, i.e., the output is a torque, items such as gears and screwdrivers can fall within this category.
A wheel and axle is a lever that rotates in a circle around a center point or fulcrum. The larger wheel (or outside) rotates around the smaller wheel (axle). Bicycle wheels, ferris wheels and gears are all examples of a wheel and axle. Wheels can also have a solid shaft with the center core as the axle such as a screwdriver or drill bit or the log in a log rolling contest
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