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Newton's Third Law for book on a table
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[QUOTE="topsquark, post: 6831688, member: 46422"] I'd write it out this way: The book's weight, the force of the Earth's gravity acting on the book ##w_{BE}##, means that the book exerts a force on the table, ##N_{TB}##. Likewise, the table exerts an equal and oppositely directed force on the book, ##N_{BT}##. Third force law pairs are the same type of force, so one can't be a normal force and the other a weight, and they act between the two objects, Book and Table. So, the Third Law pairs are ##N_{BT}## and ##N_{TB}##. The weight is the cause of the normal forces but is not the Third Law pair of either of them. -Dan [/QUOTE]
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Newton's Third Law for book on a table
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