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I Force vs Position Spring Graph Discrepancy Question

  1. May 12, 2016 #1
    I oscillated a spring attached to a force sensor above a position sensor. The position and force sensors were zeroed at the spring's equilibrium. The graph below was my result. I'm wondering as to why the graph isn't a perfect line. It makes sense that the force applied on the force sensor would be lower when the spring is rebounding up but I'm not sure why from a physics standpoint. Thanks so much
    https://lh5.googleusercontent.com/pSJvRaEHX9vfzt94ZjtmS-5aAOg45ejXglriQTtsYUT41xvIa9L3Bi2X4oOJeyybPKxDadH0pVmdPIjFUcGHuOV7yZYkHGTTekWdoxLd3qzJrCBnrxPUXoD-c93zRtKOwPTHa38a
     
  2. jcsd
  3. May 12, 2016 #2

    Dale

    Staff: Mentor

    That is from all of the dissipation mechanisms. Friction, internal heating, sound, etc. I believe that the area inside the loop is equal to the energy lost each cycle.
     
  4. May 13, 2016 #3

    robphy

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    Science Advisor
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  5. May 13, 2016 #4
    If your force sensor is piezoelectric, it has its own hysteresis as well.
     
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