Question

7. Gwen exerts a 36 N horizontal force as she pulls a 52 N sled across a cement sidewalk at constant speed, what is the coefficient of Kinetic friction between the sidewalk and the metal sled runners? Ignore air resistance

Answer 1

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 - $F_{r}$ = ma

Where $F_{r}$  = frictional force

F - $F_{r}$  = 0

F = $F_{r}$  = 36 N

$F_{r}$  = 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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