E=mc²: Einstein Explains His Famous Formula

Why physicists don’t say: ‘ potential mass/energy E=Mc^2’ ?

According to SRT rest mass and rest energy have equivalent
meaning: E= Mc^2 or M= Ec^2.
Why SRT and Quantum theory use word:’ rest mass /energy E= Mc^2 ‘
and don’t say: ‘ potential mass/energy E= Mc^2 ’ ?

When somebody says ‘ the particle in the rest . . .’, then we
can image that particle was going maybe to sleep, maybe
to have a cup of coffee . . . . etc.
That a strange terminology the physicists use.
======== .
My opinion.

In Classic physics there is ‘ potential energy’ and
there is ‘ kinetic energy’.
And „The Law of Conservation and Transformation of
Energy/ Mass" connects them together.

In Quantum physics the ’rest mass/enegy’ looks as a static factor.
I think that there is problem here.
Because in QT there is ’rest mass/enegy E=Mc^2’ and
there is active / kinetic energy E=hf. But how „The Law of
Conservation and Transformation of Energy/ Mass"
can unite them together nobody explains.

In other words:
Dont know how to explain transforms the potenial
mass/enegy E=Mc^2 into the active / kinetic energy E=hf
the physicsts began to use new terminology and new words.
================== . .
Socratus.
http://www.worldnpa.org/php2/index.php?tab0=Sci...
===================== . .

Why physicists don’t say: ‘ potential mass/energy E=Mc^2’ ?

According to SRT rest mass and rest energy have equivalent
meaning: E= Mc^2 or M= Ec^2.
Why SRT and Quantum theory use word:’ rest mass /energy E= Mc^2 ‘
and don’t say: ‘ potential mass/energy E= Mc^2 ’ ?

When somebody says ‘ the particle in the rest . . .’, then we
can image that particle was going maybe to sleep, maybe
to have a cup of coffee . . . . etc.
That a strange terminology the physicists use.
======== .
My opinion.

In Classic physics there is ‘ potential energy’ and
there is ‘ kinetic energy’.
And „The Law of Conservation and Transformation of
Energy/ Mass" connects them together.

In Quantum physics the ’rest mass/enegy’ looks as a static factor.
I think that there is problem here.
Because in QT there is ’rest mass/enegy E=Mc^2’ and
there is active / kinetic energy E=hf. But how „The Law of
Conservation and Transformation of Energy/ Mass"
can unite them together nobody explains.

In other words:
Dont know how to explain transforms the potenial
mass/enegy E=Mc^2 into the active / kinetic energy E=hf
the physicsts began to use new terminology and new words.
================== . .
Socratus.
http://www.worldnpa.org/php2/index.php?tab0=Sci...
===================== . .