  Ladder functions in classical mechanics are defined in a similar way as
ladder operators in the context of quantum mechanics. In the present paper, we
develop a new method for obtaining ladder functions of one dimensional systems
by means of a product of two `factor functions'. We apply this method to the
curved Kepler-Coulomb and Rosen-Morse II systems whose ladder functions were
not found yet. The ladder functions here obtained are applied to get the motion
of the system.
