Question

two people push on the same door from opposite sides as shown. they will only see the door move when both people exert the same force so that the forces are unbalanced. neither person exerts a force on the door so that the net force is zero. one person exerts more force than the other so that the forces are unbalanced. both people exert the same force so that the forces are balanced.

Explanation:

According to Newton's first - law of motion, an object at rest (the door initially) will remain at rest unless acted upon by an unbalanced force. When two people push on the door from opposite sides, if the forces are equal (balanced), the net force on the door is zero and it won't move. When one person exerts more force than the other, the forces are unbalanced and the door will move in the direction of the greater force.

Answer:

one person exerts more force than the other so that the forces are unbalanced.