Q. A boy of mass $100\ g$ is sliding from an inclined plane of inclination $30{^\circ}$. What is the frictional force experienced if $\mu = 1.7$
A) $1.7 \times \sqrt{2} \times \frac{1}{\sqrt{3}}N$
B) $1.7 \times \sqrt{3} \times \frac{1}{2}N$
C) $1.7 \times \sqrt{3}N$
D) $1.7 \times \sqrt{2} \times \frac{1}{3}N$
Explanation
(b) $F_{k} = \mu_{k}R = \mu_{k}mg\cos\theta$
$F_{k} = 1.7 \times 0.1 \times 10 \times \cos 30{^\circ} = 1.7 \times \frac{\sqrt{3}}{2}N$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.