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 Form 3 Physics Newton's laws of motion questions and answers

A box of mass 50 kg is dragged on a horizontal floor by means of a rope tied to its front. If the coefficient of kinetic friction between the floor and the box is 0.30, what is the force required to move the box at uniform speed?

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Answer Text:
Ff = μFn
Fn= weight = #50times10# = 500 N
Ff = #0.30 times500 = 150 #N