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B Force directly proportional to negative of displacement?

  1. Sep 19, 2016 #1
    I don't seem to understand this formula. How there should a negative sign before the displacement.Can anyone help me out?
     
  2. jcsd
  3. Sep 19, 2016 #2

    Orodruin

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    I assume you are talking about a spring.

    The minus sign tells you that the force is in the opposite direction as compared to the displacement. If you pull one end of the spring to the right, it will act on you with a force to the left trying to restore itself to the unstrained shape.
     
  4. Sep 19, 2016 #3
    It was indeed about spring! Thanks a lot!
     
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