A book is placed on a chair. Then a videocassette is placed on the book. The floor exerts a normal force
A) on all three.
B) only on the book.
C) only on the chair.
D) upwards on the chair and downwards on the book.
E) only on the objects that you have defined to be part of the system.

Question

Quizplus · Accepted Answer

The floor exerts a normal force upwards on the chair, which in turn supports the book and videocassette. The normal force from the floor does not act directly on the book or videocassette.

A Book Is Placed on a Chair