Physics

Problem

5\,\text{kg}

block is tightly sandwiched between two parallel rough vertical walls. A horizontal force

F

is applied on the block, pressing it equally against both walls. The coefficient of static friction between the block and each wall is

0.4

. Assuming the block is just on the verge of slipping downward, determine the minimum value of

F

that will keep it at rest. (Take

g = 10\,\text{m s}^{-2}

.) a)

100\,\text{N}

125\,\text{N}

62.5\,\text{N}

50\,\text{N}