ball bear which force
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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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it is not a force it is a friction
ball bearing uses rollings friction
when ball stops it can be make it into motion by grease it maintains separation between two races
it is used in spinners skates
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