We don't have the answer to "what is X?" where X is anything fundamental. And we only have the answer to "What is Y?" where Y is anything else because we can describe Y in terms of a configuration of somethings or things X, which we don't have an answer to.
So, fundamentally, we don't know what anything is at all.
Good answer not sure I could have said it better myself.
Lets look at another basic definition.Potential energy: the energy possessed by a body by virtue of its position relative to others
So how many objects do you need to define potential energy?
Now think about that definition when the second objects undergoes kinetic motion. What happens to the potential energy in going towards or away from the other object?
Then equate that back to your conservation laws. Keep in mind the definition of energy. Ability to perform work
forget fundamental just focus on the above definitions.
The answer everyone should arrive at is that energy doesn't need to come from anywhere. It is a consequence of relations between two or more objects/events/mass etc. This is precisely why energy is defined as a property. In order to define this property you need to define the system. If you have no interaction between two objects/events etc energy=0
Potential or otherwise. Lol mass itself is an interaction.
Now lets take the above one step further mass and energy relations... both are literally due to interactions. In other words they are two properties describing interaction between two or more objects/events etc. Now apply time.definition Rate of change or duration. So time isn't fundamental either but a property.
Lol how many forum threads did I just kill ? using nothing more than the Physics definitions?
Edited by Mordred, 26 January 2017 - 10:18 PM.