Question

what is ball bearings

Answer 1

A ball bearing is a type of rolling-element bearing that uses balls to maintain the separation between the bearing races. The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. 

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Answer 2

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ball bearings:a bearing in which the parts are separated by a ring of small freely rotating metal balls which reduce friction.a metal ball used in a ball bearing.
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