Magnitude of the kinetic friction force (5-6)

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Question

...and the normal force exerted on the object by the surface on which it slides.
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Review

We’ll model the kinetic friction force as being independent of how fast the two objects slide past each \perpher, as well as independent of the area of contact between the objects. (This model works well in many situations.) Then, we can write an expression for the magnitude \(f_k\) of the kinetic friction force: