PHYSICS · Single correct · AP · Physics 1: Algebra-based · Force and Translational Dynamics · Force and Translational Dynamics
Problem
A book of mass m rests on a horizontal table. The weight mg of the book acts downward and the normal reaction N of the table acts upward on the book.
Which of the following best describes the relationship between mg and N?
(a) N and mg constitute an action–reaction pair in accordance with Newton’s third law.
(b) They are equal and opposite forces acting on the same body, but they do not form a third-law pair.
(c) They cancel each other on the table, so the table experiences no downward force from the book.
(d) The normal reaction must be slightly greater than the weight, otherwise the book would sink into the table.