Question

A body of mass 100 g is sliding from an inclined plane of inclination 30°. 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. $1.7 \times \sqrt { 2 } \times \frac { 1 } { 3 } N$

Answer 1

Answer: (B)

$1.7 \times \sqrt { 3 } \times \frac { 1 } { 2 } N$

Answer 2

$F _ { k } = \mu _ { k } R = \mu _ { k } m g \cos \theta$

$F _ { k } = 1.7 \times 0.1 \times 10 \times \cos 30 ^ { \circ }$ $= 1.7 \times \frac { \sqrt { 3 } } { 2 } \mathrm {~N}$