Q. A body of mass $2\ kg$ is kept by pressing to a vertical wall by a force of $100\ N$. The coefficient of friction between wall and body is 0.3. Then the frictional force is equal to
A) $6\ N$
B) $20\ N$
C) $600\ N$
D) $700\ N$
Explanation
(b) For the given condition, Static friction
= Applied force = Weight of body $= 2 \times 10 = 20\ N$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.