No. If there are forces on an object, they need to have a counterforce, otherwise the object won't be zero. Since there are only 5 forces, the 5th force has no counterforce, resulting in movement or reforming the object.
-- Whatever the resultant of four of the forces is, one more force with the same magnitude in exactly the opposite direction makes the overall net force zero.
-- Example: 4 cheerleaders are in a tug-of-war against the captain of the football team. The flag in the middle of the rope is stationary. He's holding off all 4 of the skinny girls. The net force on the flag is zero.
