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Work done by conservative forces

  1. Apr 5, 2015 #1
    amount of work done by conservative force
    =amount of decrement in potential energy
    Is this correct?I think yes
    Because I have been told that
    Work done by non-conservative forces + work done by conservative forces = change in kinetic energy

    but
    Work done by non-conservative forces = change in potential energy + change in kinetic energy
    so it implies

    work done by conservative forces= negative of change in potential energy
    So that change in potential energy cancels out and Work done by non-conservative forces + work done by conservative forces = change in kinetic energy.
     
  2. jcsd
  3. Apr 5, 2015 #2
    Yes, the work done by the conservative force is equal to the negative of the change in potential energy. By definition of potential energy.
    I don't understand your last sentence. But there is no problem with this definition.
    The change in kinetic energy is equal to the work done by all forces. Maybe using math formulas instead of word "formulas" will help.
     
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