explain why rolling friction is less than sliding friction in easy wording
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Rolling friction is the force resisting the motion when a body (such as a ball, tire, or wheel) rolls on a surface. ... As the area of contact is less in the case of rolling than in the case of sliding, rolling friction is less than the sliding friction.
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In sliding friction :-
wheels help to reduce it
in rolling friction :-
the irregularities do not lock and in contact with the surface
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