A bearing is a machine element that constrains relative motion between moving parts to only the desired motion..The term "bearing" is derived from the verb "to bear; a bearing being a machine element that allows one part to bear (i.e., to support) another.
The invention of the rolling bearing, in the form of wooden rollers supporting, or bearing, an object being moved is of great antiquity, and may predate the invention of the wheel. Leonardo da Vinci incorporated drawings of ball bearings in his design for a helicopter around theyear 1500.
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