Which of the following statements are true about mechanical energy? Include all that apply.

8. If an object gains mechanical energy, then one can be certain that a non-conservative force is doing work. is done.

T

3. The mechanical energy of an object is always conserved.

F

2. Heat is a form of mechanical energy.

F

4. When non-conservative forces do work, energy is transforined from kinetic to potential (or vice versa), but the total mechanical energy is conserved.

F

. 7. The total mechanical energy of an object remains constant if the only forces doing work on the object are conservative forces.

T

5. A bowling ball is mounted from a ceiling by way of a strong cable. It is drawn back and released, as a pendulum. As it swings from its highest position to its lowest position, the total mechanical energy is mostly conserved.

T

1. The total amount of mechanical energy of an object is the sum of its potential energy and the kinetic energy.

T

6. when friction does not work on an object the total mechanical energy on that object is changed

T