Question

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

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