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I'm Reviewing NS Exam 1 right now, and have a question about #27 on the physics section.
Question: "A book rests horizontally on a table. The book experiences a gravitational force of mg due to the earth’s gravity. According to Newton’s third law:"
The correct answer is "the earth experiences a gravitational force of mg from the book"
I answered that the normal force would oppose Fg. "the book experiences a normal force of mg pushing up due to the table."
I understand the reasoning behind the correct answer, my question is if Force of gravity exerted on an object by the earth and vice versa constitutes a Newton's Third Law Pair, then what is the "equal and opposite reaction" to the normal force? We all learned to to draw free body diagrams with force of gravity being opposed by the normal force, so if that isn't Newton's third law where does it come from?
Question: "A book rests horizontally on a table. The book experiences a gravitational force of mg due to the earth’s gravity. According to Newton’s third law:"
The correct answer is "the earth experiences a gravitational force of mg from the book"
I answered that the normal force would oppose Fg. "the book experiences a normal force of mg pushing up due to the table."
I understand the reasoning behind the correct answer, my question is if Force of gravity exerted on an object by the earth and vice versa constitutes a Newton's Third Law Pair, then what is the "equal and opposite reaction" to the normal force? We all learned to to draw free body diagrams with force of gravity being opposed by the normal force, so if that isn't Newton's third law where does it come from?