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easyMCQNEET (UG) 20182026Physics
1 mark

Which one of the following statements is incorrect?

  1. A
    Frictional force opposes the relative motion.
  2. B
    Limiting value of static friction is directly proportional to normal reaction.
  3. C
    Rolling friction is smaller than sliding friction.
  4. D
    Coefficient of sliding friction has dimensions of length.

Solution & Step-by-step Explanation

1. Friction opposes relative motion (True).2. (True).3. Rolling friction is generally much smaller than sliding friction (True).4. The coefficient of friction () is the ratio of two forces (), hence it is a dimensionless quantity. Statement D is incorrect.

Practice this question

Try it yourself before checking the explanation above.

Which one of the following statements is incorrect?
A
Frictional force opposes the relative motion.
B
Limiting value of static friction is directly proportional to normal reaction.
C
Rolling friction is smaller than sliding friction.
D
Coefficient of sliding friction has dimensions of length.

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