A critically damped system is one in which the system does not oscillate and returns to its equilibrium position without oscillating. Even, in an overdamped system the system does not oscillate and returns to its equilibrium position without oscillating but at a slower rate compared to a critically damped system. My questions are: 1) An automatic door close is an example of an overdamped system.Right? I want to know how is this overdamping property achieved in an automatic door closer practically? 2)Can anyone give an example of critically damped system and again tell me how are the characteristics of being critically damped achieved practically? Please help!!