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Section A.2
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What does the kinetic friction force depend on?
The types of surfaces that are in contact.
What does kinetic friction force not depend on?
Surface area and speed
What is friction due to?
The microscopic imperfections of two contact surfaces
Even smooth surfaces are rough
What is Kinetic Friction Force?
The magnitude of the kinetic friction is proportional to the normal force
What is the coefficient of kinetic force?
𝝁𝒌
Kinetic friction and the normal force have units of newton’s; this, the coefficient of kinetic friction is?
Unitless
A problem states that the friction is 0.25. What quantity is given?
Coefficient of kinetic friction, since there are no units