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A book whose mass is 2 kg rests on a tab...

A book whose mass is 2 kg rests on a table. Find the magnitude of the force exerted by the table on the book.

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The book experiences two forces: The downward pull of the Earth's gravity and the upward, supporting force exerted by the table. Since the book is at rest on the table, its acceleration is zero, so the net force on the book must be zero. Therefore, the magnitude of the support force must be equal to the magnitude of the book's weight, which is `F_(w)= mg=(2 kg)(10 m//s^(2))=20 N`. This force is known as the normal force.
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