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Rolling Versus Sliding Friction in Bearings

Why rolling elements resist motion far less than surfaces sliding directly against each other, which is the whole reason a bearing exists between a rotating shaft and its housing.

Chief Galen Tyrol Video

Rolling Friction in Sealed Cartridge Bearings

Why rolling elements in a bearing generate much lower resistance than sliding contact, and how that resistance rises as seals degrade and contamination or corrosion enters the races.