Chapter 6, Problem 31A

If you push horizontally on your book with a force of 1 N to make the book slide at constant velocity, how much is the force of friction on the book

To determine

The force of friction on the book.

Explanation of Solution

Introduction:

The expression for friction force as follows:

  $f=\mu N$

Here, $\mu$ is the friction coefficient and $N$ is the normal force.

To push the book with a force of 1 N in order to slide the book at constant velocity, the net force acting on the book is zero. The application of 1 N force on the book to slide it is a same frictional force that occurs but in opposite direction of its motion.

Conclusion:

Thus, the force of friction on the book is 1 N in opposite direction.