Answered: As a girl pushes an object across a…

Glencoe Physics: Principles and Problems, Student Edition

1st Edition

ISBN:9780078807213

Author:Paul W. Zitzewitz

Publisher:Paul W. Zitzewitz

Chapter5: Displacement And Force In Two Dimensions

Section: Chapter Questions

Problem 71A

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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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