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Physics · PYQ NEET UG 2018

हिन्दी

Which one of the following statements is incorrect?

  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.

Correct answer · Option 4

Coefficient of sliding friction has dimensions of length.

Explanation

Coefficient of sliding friction is a dimensionless quantity, hence statement (4) is incorrect.

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