Q. An ice cube is kept on an inclined plane of angle $30{^\circ}$. Coefficient of kinetic friction between block and incline plane is $1/\sqrt{3}$. What is acceleration of block
A) Zero
B) $2\ m/s^{2}$
C) $1.5\ m/s^{2}$
D) $5\ m/s^{2}$
Explanation
(a) Download acceleration
$a = g(\sin\theta - \mu\cos\theta)$
$= g\left\lbrack \sin 30 - \frac{1}{\sqrt{3}}\cos 30 \right\rbrack = g\left\lbrack \frac{1}{2} - \frac{1}{\sqrt{3}} \times \frac{\sqrt{3}}{2} \right\rbrack = 0$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.