Free energy and Mechanical energy

Free energy noun - (physics) a thermodynamic quantity equivalent to the capacity of a physical system to do work; the units of energy are joules or ergs.

Mechanical energy and free energy are semantically related. In some cases you can replace phrase "Mechanical energy" with "Free energy", this phrases are similar.

Mechanical energy noun - Energy in a mechanical form.

Free energy and mechanical energy are semantically related. Sometimes you can use "Free energy" instead a noun phrase "Mechanical energy".