title: How to accomplish pendulum effect using the accelerometer in an iOS App
body: <p>By no means I am a physics expert. I am writing an iOS (iPad to be precise) App which will present a door knob sign, hanging off a (surprise) door knob. What I need to accomplish is to simulate a pendulum effect on the sign whenever the device gets moved around using the accelerometer.</p>
  
  <p>Is it necessary for me to use a full-blown physics engine for this? If so, which one would you recommend? Or can I just make use of a couple of well-known and defined formula?</p>
  
  <p>As usual, thanks to you all.</p>
  
  <p>Best,</p>