Albert presses a book against a wall with his hand. As Albert gets tired, he exerts less force, but the book remains in the same spot on the wall. Classify each force on the book as increasing, decreasing, or not changing in magnitude when Albert reduces the force he is applying to the book. Not every classification must be used.   Is each one of the following increasing, decreasing or not changing: 1) weight of the book 2) maximum static frictional force of the wall on the book 3) NORMAL FORCE OF WALL ON THE BOOK 4)frictional force of wall on the book

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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?”