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 reaction.

  • C

    Coefficient of sliding friction has dimensions of length.

  • D

    Frictional force opposes the relative motion.

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  • [IIT 1994]