We presented energy as the capacity of a body to modify its environment.  The word "modify" includes many things: illuminate, heat, ... move.  The work developed by a force is in the end produced by some type of energy.  This energy is transformed into work and thus they share the same unit of measure the joule (J).

Let's think about the Principle of Conservation of Mechanical Energy.  Does it only apply to free fall?

If we were able to take into account all the energy transformations both into other forms of energy (heat, light, kinetic ...) and in work, which take place in a process, we could generalize the Principle of the Conservation of Energy.

Basically all or some of the following types of energy intervene in a movement: