A 17-kg sled is being pulled along the horizontal snow-covered ground by a horiz
ID: 1352525 • Letter: A
Question
A 17-kg sled is being pulled along the horizontal snow-covered ground by a horizontal force of 28 N. Starting from rest, the sled attains a speed of 1.9 m/s in 8.6 m. Find the coefficient of kinetic friction between the runners of the sled and the snow.
A 17-kg sled is being pulled along the horizontal snow-covered ground by a horizontal force of 28 N. Starting from rest, the sled attains a speed of 1.9 m/s in 8.6 m. Find the coefficient of kinetic friction between the runners of the sled and the snow.Explanation / Answer
work done by the net force = change in KE + change in PE
(F-f)*S = change in KE
(28-f)*8.6 = 0.5*17*1.9*1.9 = 30.685
frictional force f = 24.43 N
f = mu_k*m*g = 24.43
mu_k = 24.43/(m*g) = 24.43/(17*9.81) =0.146
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