A bearing is a part of a machine that endures friction, often caused by a rotating part. A rotating ball produces less friction than two surfaces that are sliding against each other because there is less contact. Balls, or spheres, only contact the inner and outer race at a small point and because of this it cannot handle heavier loads without deforming. Roller bearings are cylindrical which means that the contact between the inner and outer races are a line, not a point. This allows them to support heavier loads without deforming.
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