Question

why is rolling friction is smaller than sliding friction

Answer 1

Rolling friction is the resistance to motion experienced by a body when it rolls upon another. It is much less than sliding friction for same pair of bodies. When one body rolls upon another, there is theoretically no sliding or slip between them. And if both are perfectly rigid, there is no surface of contact. 

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Answer 2

smaller factor is cause the difference continuously and area sliding frication is continuous and has closer area than rolling frication