The force required to just make the stationary object start moving is 4N. This is due to the force of static friction between the object and the surface it is placed on. To move the object, this force of friction has to be overcome.
Once the object has been set into motion, there is a force of kinetic friction between the object and the surface. In most cases the coefficient of kinetic friction is less than that of static friction, but there is a force opposing the motion nevertheless.
From the way you have framed your question I think you are applying the force instantaneously and not over a prolonged duration of time. The force applied will make the body start moving but it will move only for a small duration of time which is required for the force of friction to bring it to a halt.