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The Egyptians used the wheel and axle by transporting big stones blocks so they could build houses and pyramids
The wheel and axle are primarily used for moving items and for transportation. It vastly reduces the friction between objects by converting it to a rotational motion. Common non-vehicular axles are seen in roller conveyors (with or without covering belts). A door knob is the reverse version of a wheel and axle. It translates a small force on the turning wheel to operate the axle (cylinder), which turns the door spindle (bolt).
A water mill works by flowing water over the wheel, which turns, turning the axle. As the axle turns it is used to power an object. Water mills were typically used to grind grain into flour.
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the radius of the axle and the radius of the wheel
wheel is a type of circle which is used in vehicles etc. and axle in science means which is related to wheel. like friction is needed so that wheels could turn about the axle.
A wheelbarrow is not a simple machine; it is a complex machine. There are two simple machines used in it. One is a lever, and the other is the wheel and axle.A leverA 3rd class lever and a wheel.lever and wheel-and-axle
Wheel and Axle and a Lever.