Question

A block of weight $1N$ rests on an inclined plane of inclination $\theta$ with the horizontal. The coefficient of friction between the block and the inclined plane is $\mu .T\eta \epsilon$ minimum force that has to be applied parallel to the inclined plane to make the body just move up the plane is

• A. $\mu \sin \theta$
• B. $\mu \cos \theta$
• C. $\mu \cos \theta -\sin \theta$
• D. $\mu \cos \theta +\sin \theta$

Answer 1

Answer: (D)

Given $mg=1N$
To just move the body up
$F=$ friction force + gravitation force
$=\mu mg\cos \theta +mg\sin \theta$
$=\mu \cos \theta +\sin \theta$