Ball Bearing
A ball bearing is a form of rolling-element bearing that uses balls to keep the bearing races apart. A ball bearing's purpose is to reduce rotational friction and to support radial and axial loads. It accomplishes this by containing the balls and transmitting the loads through the balls via at least two races. In most cases, one race is fixed, while the other is coupled to a rotating component (such as a hub or shaft). When one of the bearing races rotates, the balls rotate as well. Because the balls are rolling, their coefficient of friction is substantially lower than if two flat surfaces were moving against each other.
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