The coefficient of static friction between a wooden block of mass 0 . 5 kg and a vertical rough wall is 0 . 2 . The magnitude of the horizontal force that should be applied on the block to keep it adhere to the wall will be______ N . g = 10 m s - 2

Step-by-step solution

F . B . D . of the block is shown in the diagram Since block is at rest therefore f r - m g = 0                           . . . 1 F - N = 0                             . . . 2 f r ≤ μ N In limiting case f r = μ N = μ F                       … 3 Using eq. 1 and 3 ∴     μ F = m g &#8