question_answer

In case of a book lying on table :

A)  action of book and reaction of table on book are equal and opposite and are inclined to vertical

B)  action and reaction are equal but act in the same direction

C)  action and reaction are equal and opposite and act perpendicular to the surface of contact

D)  action and reaction are not equal but act in opposite direction

Correct Answer: C

Solution :

                Newtons third law states that if a body exerts a force on a second body, the second body exerts a force that is equal in magnitude and opposite in direction to the first force. The book lying on the table is exerting a downward force on the table while the table is exerting an upward reaction force on the book. Because the forces are equal and Opposite the book remains at rest.