Question

A body of mass 100 g is sliding from an inclined plane of inclination ${30}^o$. 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. $1.7\times \sqrt{2}N$
• D. $1.7\times \sqrt{2}\times \frac{\sqrt{2}}{\sqrt{3}}N$

Answer 1

The correct option is B $1.7\times \sqrt{3}\times \frac{1}{2}N$

.Since the body is sliding,
force of friction $F=\mu mg\cos \theta$
$=1.7\times 0.1\times 10\times \frac{\sqrt{3}}{2}$
Note : If the body on inclined plane is in equilibrium, the force of friction is $mg\sin \theta$.