Question:
how can rolling friction be less than sliding friction
Answer:
Friction is always dependent on the surface area of contact between the objects.
Rolling friction can be produced by two objects in contact, ou tof which at least one object is spherical (round) in shape. Thus, when a spherical object rolls on another object, the surface area of contact is necessarily less than the surface area of contact when two objects slide over one another to give sliding friction.
Thus rolling friction is less than sliding friction.
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