Question

39. A heavy body of mass 25 kg is to be dragged along a horizontal plane (u =
1/3). If the plane is gradually inclined, the block will begin to slide when the
inclination of the plane is:​

Answer 1

Explanation:

Box will begin to slide when sliding force will be more then friction , Assume that angle is alpha then .

$\mu \: mg \sin( \alpha ) = mg \cos( \alpha ) \\ \alpha = \tan {}^{ - 1} ( \frac{1}{ \mu} ) = \tan {}^{ - 1} ( \frac{1}{3} )$