By Ignoring air resistance, the coefficient of Kinetic friction between the sidewalk and the metal sled runners is 0.69
FRICTION
Friction is a force that opposes motion.
Given that Gwen exerts a 36 N horizontal force as she pulls a 52 N sled across a cement sidewalk at constant speed
- At constant speed, acceleration a = 0
- Force applied F = 36 N
- The weight = Normal reaction N = 52
From Newton's law,
Sum of forces = ma
That is,
F - = ma
Where = frictional force
F - = 0
F = = 36 N
= μN
Where μ = coefficient of kinetic friction
36 = μ x 52
μ = 36/52
μ = 0.69
Therefore, the coefficient of Kinetic friction between the sidewalk and the metal sled runners is 0.69 when we Ignore air resistance.
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