Q. What is the maximum value of the force $F$ such that the block shown in the arrangement, does not move
A) $20\ N$
B) $10\ N$
C) $12\ N$
D) $15\ N$
Explanation
(a) [image:5_image243.wmf]
$f = \mu R \Rightarrow F\cos{60{^\circ}} = \mu\left( W + F\sin{60{^\circ}} \right)$
Substituting $\mu = \frac{1}{2\sqrt{3}}\ \&\ W = 10\sqrt{3}$
We get $F = 20\ N$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.