Q. 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.
Explanation
[Solution] The coefficient of friction is a ratio of forces and is dimensionless. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.