Question

A body of mass 100 g is sliding from an inclined plane of inclination $ 30{}^\circ $ . What is the frictional force experienced if $ \mu =0.7 $ ?

• A. $ 0.7\times \sqrt{2}\times \frac{1}{\sqrt{3}}N $
• B. $ 0.7\times \sqrt{3}\times \frac{1}{2}N $
• C. $ 0.7\times \sqrt{3}N $
• D. $ 0.7\times 2\times \frac{1}{\sqrt{3}}N $

Answer 1

Answer: (B)

: $ F=\mu R=\mu mg\cos \theta $ $ F=0.7\times \frac{100}{1000}\times 10\times \cos 30{}^\circ =0.7\times \frac{\sqrt{3}}{2}N $