Question

Q1: A student draws a force diagram for a book resting on a table. What is the “Newton’s third law pair force” of FEarth on book?

A)F table on book because it is equal and opposite to F Earth on book.

B) F table on book because it is balancing FEarth on book, preventing the book from moving down.

c) F book on Earth because they’re equal and opposite forces.

d)F book on Earth because it is part the gravitational interaction between Earth and book.

Q2: Why don’t we draw Fbook on table into the force diagram for the book resting on the table in the previous question?

a)It is a mistake! Fbook on table should be in the book’s force diagram.

b)Because we can be selective about which forces to include in a force diagram. We could have put it in if we wanted to.

c)Because Fbook on table represents the force exerted by the book on the table, which is part of the table’s force diagram, not the book’s force diagram.

d)Because if we did, it would cancel out Ftable on book, resulting in an unbalanced force exerted by Earth on book.

Answer 1