Two identical books are stacked on a table. A third identical book is then placed on...
Two identical books are stacked on a table. A third identical book is then placed on top of the first two, causing an increase in the normal force exerted by the bottom book on the middle book. Which of the following is a correct explanation for the increase in this normal force?
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A-The normal force on an object is equal in magnitude and opposite in direction to the force of gravity on that object.
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B-The addition of the top book causes the force of gravity on the table to increase.
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C- The forces of gravity on the bottom book and middle book increase because of the additional mass of the top book.
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D- The third book produces an additional downward force on the middle book, thus increasing the upward force exerted by the bottom book to maintain equilibrium.
Homework Answers
As the third book is kept over the second book, it exerts its downward weight in addition to the weight of the second book on the first book, therefore normal force due to first book on second book increases.
Answer (D)
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