We exert a force when we push or pull a body. Force is exerted when we pull a chair or push a door. Force is measured in newton (N). The given table shows values of five individuals that exerted a force in pushing the same box. Observe the table carefully and then answer the given questions.

Individual	Force Exerted (N)
A	112.5
B	48
C	135
D	102
E	81

(a) Which individual exerted maximum force while pushing the box?

(b) Which individual exerted minimum force while pushing the box?

(c) Why do you think the force exerted in pushing the box varies from person to person?

(d) What are the forces involved in pushing a box?

(e) How do you think the force exerted in pushing the box be reduced?

(a) C exerted maximum force (135 N) while pushing the box.

(b) B exerted minimum force (48 N) while pushing the box

(c) The force varies because each person has a different amount of strength as some individuals can push harder due to more muscular force, while others exert less force due to less strength or body build.

(d) Forces involved in pushing a box :

• Applied force : The push given by the individual.
• Frictional force : The resistance between the surface of the box and the ground.

(e) The force exerted in pushing the box can be reduced by reducing friction, such as using wheels, roller under the box or lubricating the contact surface.