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Solution


Q.

Which one of the following statements is incorrect           [2018]
1 Rolling friction is smaller than sliding friction.  
2 Limiting value of static friction is directly proportional to normal reaction.  
3 Frictional force opposes the relative motion.  
4 Coefficient of sliding friction has dimensions of length.  

Ans.

(4)

Coefficient of sliding friction has no dimension.

f=μsN ⇒ μs=fN