The source of the energy with which a participant exerts force.
- internal : EnergySource
The participant's own energy, as with living things, self-propelled machines and natural agents (Cruse's agentive feature).
- imparted : EnergySource
Energy imparted to the participant or held in its position or motion, as with a projectile or a load-bearing column (Cruse's effective feature).
- instrumental : EnergySource
The energy of a participant that uses it, as with an instrument or a body part (Cruse's and Fillmore's instrumental).
Derives DecidableEq, Fintype.
Used by EnergySource.IsSelfEnergetic
Used in Cruse1973, RappaportHovavLevin2024