How to make a rigid body that never stops

Hi , as the title says i want to make a rigid body that never stops , i have tried to make the friction = 0 and make the drag = 0 but it havn’t worked

I want to make a sphere to move on a U shaped collider with out stopping

thanks

The friction is not the only force being applied. I think that your ball is losing speed when collide with the curve in the tube.

Should be better to create a script. You could get its speed when its enter in the tube and apply a little force when it gets slow.