Answered: As a girl pushes an object across a…

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter4: The Laws Of Motion

Section: Chapter Questions

Problem 60AP: (a) What is the minimum force of friction required to hold the system of Figure P4.74 in...

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Question

As a girl pushes an object across a wood floor, she suddenly comes to an area where the floor has been waxed recently, making it slippery. What becomes true of the coefficient of kinetic friction? A. The coefficient of kinetic friction increases. B. The coefficient of kinetic friction decreases. C. The coefficient of kinetic friction becomes zero. D. The coefficient of kinetic friction becomes negative.

Expert Solution

Step 1

In order to resolve the above problem, the concept of kinetic friction is used. When an object undergo sliding motion over any surface, then the surface tend to exert some force to resist the sliding motion of object. This resisting force is known as kinetic frictional force.

Its mathematical expression is given as,

$f_{k} = μ_{k} N$

Here,

$f_{k}$ is the kinetic frictional force.

$μ_{k}$ is coefficient of kinetic friction.

N is the normal force.

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