Interlude A: Kinetic Friction Force

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Section A.2

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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