Recent content by JohnDear

  1. J

    Forces required to accelerate a mass on a spring

    After thinking about it I think my approach is fair. In the free motion case F = ma. In the rubber compression case F = ma + k.d (k the spring constant of rubber assuming it behaves linearily). I see no reason why I can't treat the two force components independently. Only issue I...
  2. J

    Forces required to accelerate a mass on a spring

    Hi, I am currently working on a project and have become stuck on what should be a relatively simple problem (I thought). Basically I am using a DC motor to provide a force on a crank that compresses a piece of rubber. The movement includes some acceleration. I am trying to use the...
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