Q. A horizontal force of $10\ N$ is necessary to just hold a block stationary against a wall. The coefficient of friction between the block and the wall is $0.2$. The weight of the block is
A) $2\ N$
B) $20\ N$
C) $50\ N$
D) $100\ N$
Explanation
(a) $F = \frac{W}{\mu}\ \therefore W = \mu F = 0.2 \times 10 = 2N$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.