This paper examines the use of motorized physical sliders with position and force as input and output parameters for tangible human computer interaction. Firstly, we present an analogue platform. It was used to realize two proof-ofconcept applications: one for learning system dynamics as part of physics education and the second for interaction with music loops. Based on the insight gained with the analogue platform and the two applications, we took the first steps towards a digital platform, also presented here. More generally, the paper presents socalled haptic modes, which may be generated using force feedback control of motorized sliders. The paper also briefly presents parts of the underlying software and hardware which was designed and realized as part of this project. Author Keywords HCI, User interface design, physical prototyping, haptic interface, force feedback, slider, TUI ACM Classification Keywords H.5.2 User Interfaces: Tangible user interfaces (TUI), Haptic interface, p...