Does Addforce slow down

If you use AddForce only once, it works like a hit in a ball. Then the air resistance and the gravity will do the rest. Drag will make it stop faster with a higher value. Angular drag is the drag while rotating.

If you apply constant force, then drag and gravity will still affect though, it kinda slow it down. Like when a car is driving, there are torque from the wheels but friction from the wheels as well and air resistance.

Finally the material will also affect, if you use a plastic material on icy material, you get a puck on an ice rink, and it will go for a long time. If you use rubber on wood, or even rubber on rubber, then it will require a bigger force to move if both object are resting on each other.