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17 March, 10:30

A book resting on a table experiences an upward normal force from the table that is equal in size, but opposite in direction, to the weight of the book. Is this an example of Newton's Third Law (force pairs) ? If so, explain why. If not, explain what the force pairs should be.

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  1. 17 March, 13:50
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    No.

    Explanation:

    The weight of the book and the normal force on the book are two forces equal and opposite in direction but both forces are acting on the same object, the book. These two forces can not be force pairs since force pairs must be acting between two distinct objects.

    The two force pairs are:

    1. The weight of the book due to gravity. The book is pulling on the planet earth with the same force in the opposite direction as the planet is pulling on the book (weight of the book).

    2. The normal force. The book is pushing the table down with the same force as the table pushes the book up in the opposite direction.
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