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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. Coefficient of sliding friction has dimensions of length.
4. Frictional force opposes the relative motion.

Correct answer: Coefficient of sliding friction has dimensions of length.

Solution

The coefficient of sliding friction is a dimensionless quantity as it is the ratio of two forces (frictional force and normal reaction). Therefore, option C is incorrect.

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