A book rests on the shelf of a bookcase. The reaction force to the force of grav

Question

A book rests on the shelf of a bookcase. The reaction force to the force of gravity acting on the bookis a) none of these b) the frictional force between book and shelf c) the force of the shelf holding the book up d) the weight of the book e) the force exerted by the book on the earth A book rests on the shelf of a bookcase. The reaction force to the force of gravity acting on the bookis a) none of these b) the frictional force between book and shelf c) the force of the shelf holding the book up d) the weight of the book e) the force exerted by the book on the earth

Explanation / Answer

Newtons third law, for every force there is a reaction force thathas the same magnitude but opposite direction. The earth exerts a gravitational force on the book, so the bookexerts a gravitiational force on the earth. The answer is e

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