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S.H.M. Help plea

  1. Dec 30, 2013 #1
    Acceleration is directly proportional to DISPLACEMENT in S.H.M.

    Is that true? a=-w^2x, so the graph has negative gradient, is this okay for direct proportion? I though it wasn't okay.

    Thanks
     
  2. jcsd
  3. Dec 30, 2013 #2

    mfb

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    2016 Award

    Staff: Mentor

    "directly proportional" is independent of the sign. Yes it can be negative.
     
  4. Dec 30, 2013 #3
    Thank you:)
     
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