Question

A box lying on an inclined plane. If the box starts sliding when the angle of inclination is ${45}^o$ , then its coefficient of friction will be :

• A. 1
• B. 2
• C. $\sqrt{3}$
• D. $\frac{\sqrt{3}}{2}$

Answer 1

The correct option is A 1

The angle of inclination $\theta ={45}^o.$ The coefficient of static friction is given by

$\mu =\tan \theta =\tan {45}^o=1$