A block of mass 5 kg rests on a inclined plane at an angle of `30^(@)` with the horizontal. If the block just begins to slide, then what is the coefficient of static friction between the block and the surface?

Explanation

In equilibrium , the resultant of these forces must be zero .

` :. Mg sin theta = f_(s)`
` :. tan theta = (f_(s))/N`
As ` f_(s) = mu_(s) N`
` :. tan theta mu_(s)`
` :. Mu_(s) = tan 30^(@)`
` :. mu_(s) = 0*577`