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Mechanical Energy of a system: Conceptual Problem

  1. Feb 26, 2013 #1
    1. The problem statement, all variables and given/known data

    Which of the following statements is/are true?
    Choose all that apply.

    a. The total mechanical energy of a system, at any one instant, is either all kinetic or all potential energy.
    b. The total mechanical energy of a system is equally divided between kinetic and potential energy.
    c. The total mechanical energy of a system is constant only if conservative forces act.
    d. The total mechanical energy of a system is constant only if nonconservative forces act.
    e. Mechanical energy can be dissipated to nonmechanical forms of energy.

    2. Relevant equations

    N/A

    3. The attempt at a solution

    I believe the answers are both c and e. I just wanted to clear up letter c because conservative forces are the ones that make total mechanical energy of a system constant, correct? Not nonconservative forces, because they would dissipate over time. Is this correct?
     
  2. jcsd
  3. Feb 26, 2013 #2

    haruspex

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    Your answers look right to me.
     
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