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A block of mass M is held against a rough vertical wall by pressing it with a finger. If the coefficient of friction between the block and the wall is μ and the acceleration due to gravity is g, calculate the minimum force required to be applied by the finger to hold the block against the wall? |
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Answer» Let F force is applied by finger on a body of mass M, Under Balanced condition, F N The normal reaction of the wall on the book. The minimum upward frictional force needed to ensure that the block does not fall is Mg. the friction force = μN. Thus, minimum value of F = \(\frac{Mg}{μ}\) f=uNMg=uN Mg/u=N thus force required is Mg/u |
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