Question

What is the minimum value of force ( in following two cases ) required to pull a block of mass m on a horizontal surface having coefficient of friction $\mu$ ? Also find the angle this force makes with the horizontal.

Answer 1

$f_{smax}=\mu N$

$N=mg$ (equilibrium in vertical direction)

$f_{smax}=\mu N=\mu mg$

$\Rightarrow F_{app}>F_{fmax}$