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29 Nov 2019

A book is resting on a desk. Why is is not correct to say that the normal force on the book is equal to the weight because of Newton's 3rd law?

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Deanna Hettinger
Deanna HettingerLv2
17 Dec 2019
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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

A book is resting on a horizontal table so that the only two forcesacting on it are Earth's gravity FG and normal reaction of thetable n. The result n = -FG follows


(check all that apply)
from an application of Newton's 2nd law.
from an application of Newton's 3rd law.
because the normal force always balances the force ofgravity.
because normal force is defined as gravity force in mostbooks.
A book weighing 5 N rests on top of a table.
MFS_3l_3.jpg
1.A downward force of magnitude 5 N is exerted on the book by the force of
Ā 
Ā  the table
Ā  gravity
Ā  inertia
. Ā 
2. An upward force of magnitude _____ is exerted on the _____ by the table.
A. 6N/table
B. 5N/table
C. 5N/book
D. 6N/book
Ā 
3. Do the downward force in Part A and the upward force in Part B constitute a 3rd law pair?
Ā 
Ā  yes
Ā  no
Ā  Ā 
4. The reaction to the force inPart B is a force of magnitude _____, exerted on the _____ by the_____. Its direction is _____.
A. 5N/ Table/ Book/ Upward
B. 5N/ Table/ Earth/ Upward
C. 5N/ Book/ Table/ Upward
D. 5N/ Table/ Book/Downward
E. 5N/ Earth/ Book/ Downard
Ā 
5. Which of Newton's laws indicates that the forces in Parts A and B are equal and opposite?
Ā 
Ā 
Ā  Newton's 1stor 2nd law
Ā  Newton's 3rdlaw
Ā  Ā 
6. Which of Newton's laws dictates that the forces in Parts B and Eare equal and opposite?
Ā 
Ā 
Ā  Newton's 1stor 2nd law
Ā  Newton's 3rdlaw

A person pushes a book against a wall so that the book does not move. [A] draw a free body diagram for the book. [B] for each force that appear on your free-body diaram, identify the corresponding force that completes the Newton's third law (or action-reaction) force pair.

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