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NEET2018PhysicsLaws of MotionActual

Which one of the following statements is incorrect?

Options

  1. AFrictional force opposes the relative motion
  2. BLimiting value of static friction is directly proportional to normal reaction
  3. CRolling friction is smaller than sliding friction
  4. DCoefficient of sliding friction has dimensions of length

Correct answer

D. Coefficient of sliding friction has dimensions of length

Step-by-step solution

∵ f lim = μ s N ⇒ μ s = f lim N Coefficient of sliding friction has no dimension

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