Consider a 2-kg physics textbook (not drawn to scale) pressed against a wall, which has a coefficient of kinetic friction of μk = 0.4 as shown in the animation (position is given in meters and time is given in seconds). Restart. Draw a free-body diagram for the book, showing all the forces that act. What is the net force on the book? Include both magnitude and direction in your answer. What is the force of the push represented by the hand?

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Newton’s Third Law of Motion

The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”