Does Addforce slow down

When using addforce does it slow down automatically or is it just constant? And if it does slow down what effects that slowing down? The drag correct?

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.