A book sits on a table. A person pushes downwards on the book from above. A force diagram for the book is shown below.   The force diagram has too many forces. Explain which forces don’t belong in the book’s force diagram and why.

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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?”