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

A block of metal with a mass of 20 kg requires a horizontal force of 50 N to pull it with uniform velocity along a horizontal surface. Calculate the coefficient of friction between the surface and the block. (take g = 10 m/s)

(0m 0s)
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F_n = normal reaction = Weight = 20times10=200 N
Therefore, μ =(F_f) / (F_n) =
50/ 200 = 0.25.