Magnitude of the kinetic friction force (5-6)

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Question

The force of kinetic friction depends on...
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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: