Reaction force on a book resting on top of a table.

[ysk1]

Question:

A book is resting on top of a table.

1. Do the downward force of gravity and the upward force of normal force constitute a 3rd law pair? (Yes/No)

2. The reaction to the force of gravity is exerted on the (earth/table/book) by the (earth/table/book). Its direction is (upward/downward).





According to Newton's third law, I know that reaction force occurs when object A receiving an impact from object B exerts a force equal in magnitute but opposite in direction to object B.
But how do you show this on free body diagram?



Thank you.

 

[member 553083]

Answer 1: YesAnswer 2: The reaction to the force of gravity is exerted on the table by the book. Its direction is upward.