Which one of the following statements is incorrect [NEET 2018] (a) Rolling friction is smaller t...

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Which one of the following statements is incorrect
[NEET 2018]
(a) Rolling friction is smaller than sliding friction
(b) Limiting value of static friction is directly proportional to normal reactions
(c) Frictional force opposes the relative motion
(d) Coefficient of sliding friction has dimensions of length
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