First slide

Friction on horizontal surface

Question

A block of weight 200N is pulled along a rough horizontal surface at constant speed by a force of 100N acting at an angle 30º above the horizontal. The coefficient of kinetic friction between the block and the surface is

Moderate

A

0.43
B

0.58
C

0.75
D

0.83

Solution

$Fcos θ = f_{k}, f_{k} = μ_{k} N, N = mg - Fsin θ$

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