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 adh

Question

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

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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 ⇒ F = 0 . 5 × 10 0 . 2 = 25 N

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