Context: Energy transfer can be considered for the special case of systems which are closed to transfers of matter. The portion of the energy which is transferred by conservative forces over a distance is measured as the work the source system does on the receiving system. The portion of the energy which does not do work during the transfer is called heat.[note 4] Energy can be transferred between systems in a variety of ways. Examples include the transmission of electromagnetic energy via photons, physical collisions which transfer kinetic energy,[note 5] and the conductive transfer of thermal energy.

Question: What can be considered for the special case of systems which are closed to transfers of matter?
Answer: Energy transfer

Question: The portion of energy which does not do work during the transfer is called what?
Answer: heat

Question: Give one example of how energy can be transferred between systems?
Answer: transmission of electromagnetic energy via photons

Question: What can be considered for the typical case of systems which are opened to transfers of matter?
Answer: Unanswerable

Question: The portion of energy which works during the transfer is called what?
Answer: Unanswerable

Question: Give one example of how energy cannot be transferred between systems?
Answer: Unanswerable

Question: the inductive transer of what kind of energy?
Answer: Unanswerable

Question: what are physical collisions which don't transfer kinetic energy?
Answer: Unanswerable