Interlude A: Kinetic Friction Force
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Section A.2
Last updated 2:34 PM on 10/1/25
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7 Terms
1
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What does the kinetic friction force depend on?
The types of surfaces that are in contact.
2
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What does kinetic friction force not depend on?
Surface area and speed
3
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What is friction due to?
The microscopic imperfections of two contact surfaces
Even smooth surfaces are rough
4
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What is Kinetic Friction Force?
The magnitude of the kinetic friction is proportional to the normal force
5
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What is the coefficient of kinetic force?
𝝁𝒌
6
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Kinetic friction and the normal force have units of newton’s; this, the coefficient of kinetic friction is?
Unitless
7
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A problem states that the friction is 0.25. What quantity is given?
Coefficient of kinetic friction, since there are no units
Note 
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