You are pushing on a heavy door, trying to slide it open. If your friend stands behind you and helps you push, how have the forces changed?

AThe net force applied will increase.
BThe net force will decrease.
CThere will be less friction.
DThe applied force does not change.

Verified Answer :

A...... The net force applied will increase.

Answer: A) The net force applied will increase.

Explanation:

Both of us trying to push the door will increase the net force and this is because the force is been applied by both of us in the same direction. Forces acting in the same direction are added up to produce a resultant force which will cause an increment in the total force.