Question
Which one of the following statements is incorrect?
Frictional force opposes the relative motion.
Limiting value of static friction is directly proportional to normal reaction.
Rolling friction is smaller than sliding friction.
Coefficient of sliding friction has dimensions of length.
Coefficient of sliding friction () is defined by , so . Since both and are forces, is a dimensionless quantity. Thus, statement (4) is incorrect.
This question aligns with the NEET general syllabus, specifically targeting concepts from General. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.
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