Do we have a theory as to what energy is?

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Energy is defined as a conserved quantity in physics, fundamentally described by its properties and mathematical relationships, such as those outlined in Noether's theorem. The discussion highlights a common misconception that energy is a mysterious substance, when in fact, it is a measurable property that plays a crucial role in physical systems. The analogy of energy to velocity illustrates that both are human-defined concepts, yet energy's broader applicability leads to more complex interpretations. Some participants speculate on deeper meanings of energy, including philosophical ideas about consciousness, but these remain outside the realm of established physics. Ultimately, the conversation emphasizes the importance of accepting energy as a defined property rather than seeking a more profound explanation.
  • #31
you are taking the topic away of physics by speaking of some selfconsiousness of a quantity.
There are many quantities in physics that we can measure, but asking what they are makes no sense.
If someone asks you what water is, and you reply "atoms" you are just going into a more "fundamental" thing, yet you don't answer what water is.
"Atoms are made of energy and everything below an atom is made of energy"
this again makes no sense. How can you make such a statement if you don't know what energy is?
Energy is a measurable quantity, which happens to be conserved, that's all...

What is for example the charge? (if you get the point)


Also don't say that thing about strings and vibrating energy... It's not so simple... and of course not-verified experimentally ...
 
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  • #32
gmax137 said:
Energy is a calculated value: a number. Not only that, it is a frame-dependent value. In other words, a different number for different observers. It isn't "really" anything else.

I think that I have an idea what you are referencing to when you suggest frame-dragging as the resultant...?
Relativistic energy and (angular) momentum?
Recall the way that space and time become united in relativity theory to become the single entity 'space-time', the time coordinate t being adjoined to the
3-space position vector
x=(x^1,x^2,x^3) to give the 4-vector:
(x^0,x^1,x^2,X^3) = (t,x)
We should then find that momentum and energy become similarity united.
Any finite system in special relativity will have a total energy E and a total momentum 2-vector p.
These unite into what is called the energy-momentum 4-vector, whose spatial components are
(p^1,p^2,p^3) = c^2p,
and whose time component p^0 measures not only the total energy but also, equivalently, the total mass of the system according to
p^0 = mc^2,
which incorporates Einstein's mass-energy relation.
Correct me if I am wrong or on another tac...
 
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  • #33
It seems as if you have never heard of Lagrangian/Hamiltonian mechanics.

Zz.
 
  • #34
Hello ZapperZ,
Yes I have..
But If you would like a discussion on the merits of the Penrosian v L/H approach I would sincerely like to have your opinion.
 
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  • #35
Larry Farmer said:
What if energy itself is intelligent
The substance of your question has been fully and completely answered (even if you choose to ignore it), and further discussion will lead to nothing more than this sort of speculation. Thread closed.
 

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