Question

A boy is pushing a chair by applying a force of 5 newtons. His mother helps him push it faster by applying an additional force of 7 newtons in the same direction. What is the net force acting on the chair?
a. 2 newtons
b. 5 newtons
c. 7 newtons
d. 12 newtons
e. 14 newtons

Answer 1

12 Newtons in same direction

Answer 2

Answer: Option (d) is the correct answer.

Explanation:

Net force means the sum of total or all the forces acting on an object.

Mathematically,     $F_{total} = F_{1} + F_{2} + F_{3} +$ ....and so on

Therefore, when a boy is pushing a chair by applying a force of 5 newtons and his mother is helping him by pushing the chair with a force of 7 newtons then calculate the net force acting on the chair as follows.

                      $F_{total} = F_{1} + F_{2}$

                                      = (5 + 7) N

                                      = 12 N

Thus, we can conclude that net force acting on the chair is 12 N.