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Mechanical Energy of a system: Conceptual Problem

by Yosty22
Tags: conceptual, energy, mechanical
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Feb26-13, 06:49 PM
P: 145
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


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?
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Feb26-13, 07:15 PM
Sci Advisor
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P: 9,871
Your answers look right to me.

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