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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).

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13y ago

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