Balanced and Unbalanced Forces
By Samuel Dzioba
Since the kids on the left are pulling harder they are pulling the kids on the right. The net force of the first picture is 0 and the net force of the second picture is 100 newtons.
If they are both pulling with 800 newtons of force the net force is 0.
The feather is pulled down on less by gravity than the rock, causing the rock to go down.
Since forces on both sides are equal the book does not move. The net force is 0.
The hands are pushing the box equally so it can't move.
The net force would be 0.