Take a book. Keep it on the floor and push it with your finger. Now keep $3- 4$or more pencils under the book in a vertical position. Now push the book. 
Is less effort required to push the book?

The type of force responsible for a change in the state of motion of the arrow is an example of a _____ force.

Write the quadrants in which the following points lie:

$\left(-4,7\right)$

Name the type of forces involved in a moving boat coming to rest when rowing is stopped.