In my animation
https://www.geogebra.org/m/tr8jc8bt
where are the two bodies A and B.
We can increase the mass of body B with the appropriate button (to see
what happens to the forces) and we can highlight the two different conceptions of Newton and Einstein by clicking on the appropriate
checkbox.
For Newton there are 4 forces: the two blue and red contact forces
(action and reaction) and the two black gravitational forces.
For Einstein, there are only two forces: the blue force (the one on
body A) and the red force (the one on body B).
Is the animation correct?
Luigi Fortunati domenica 27/11/2022 alle ore 11:41:33 ha scritto:I wonder if Einstein's theory holds, if the Equivalence Principle proves
In my animation
https://www.geogebra.org/m/tr8jc8bt
where are the two bodies A and B.
We can increase the mass of body B with the appropriate button (to see
what happens to the forces) and we can highlight the two different conceptions of Newton and Einstein by clicking on the appropriate
checkbox.
For Newton there are 4 forces: the two blue and red contact forces
(action and reaction) and the two black gravitational forces.
For Einstein, there are only two forces: the blue force (the one on
body A) and the red force (the one on body B).
Is the animation correct?The animation highlights the fundamental difference between Newton's conception and that of Einstein: the presence of the two black
gravitational forces (Newton) or their absence (Einstein).
I knew that in Relativity we prefer not to talk about forces,
preferring to discuss space-time curvatures.
But I wonder (and I ask you): do space-time curvatures generate forces
or not?
The reason for this question is that, if the two black forces are not
there, body B (subjected to the red force only) should accelerate
upwards and body A (subjected to the blue force only) would accelerate downwards, moving away from each other.
And that doesn't happen.
PS. If there are any errors in my animation, I am ready to make any corrections.
I wonder if Einstein's theory holds, if the Equivalence Principle proves
to be an artificial theoretical construction, with a very limited validity,
which I strongly believe to be the case!
I could explain why I believe that, ....though ....from experience ...
I know...for some mysterious reason, people, that is physicists in most cases, want to avoid any unorthodox discussions .....by all ....and
any... costs!
Then, another thing...when we say "black forces" and such, obviously
(for me at least) we are referring to something related to the "black matter", don't we?
[[Mod. note -- No, Luigi is referring to the forces shown by black
arrows in his animation. This has nothing to do with dark matter.
-- jt]]
And this matter is there..all over the Universe....so it is present
right here, even in the matter of my computer screen, even in the air,
in my body ..and so on, isn't it?
Then ..this is the place where....electric or magnetic field is said
to exist. God forbid..somebody call it ...aether or similar! ;)
Did I get it right?
Correct me if you think I am wrong about these!
Best regards, LL
In my animation
https://www.geogebra.org/m/tr8jc8bt
where are the two bodies A and B.
We can increase the mass of body B with the appropriate button (to see
what happens to the forces) and we can highlight the two different conceptions of Newton and Einstein by clicking on the appropriate
checkbox.
For Newton there are 4 forces: the two blue and red contact forces
(action and reaction) and the two black gravitational forces.
For Einstein, there are only two forces: the blue force (the one on
body A) and the red force (the one on body B).
Is the animation correct?
The animation highlights the fundamental difference between Newton's conception and that of Einstein: the presence of the two black
gravitational forces (Newton) or their absence (Einstein).
I knew that in Relativity we prefer not to talk about forces,
preferring to discuss space-time curvatures.
But I wonder (and I ask you): do space-time curvatures generate forces
or not?
The reason for this question is that, if the two black forces are not
there, body B (subjected to the red force only) should accelerate
upwards and body A (subjected to the blue force only) would accelerate downwards, moving away from each other.
And that doesn't happen.
Geodesic motion is also known as "free-fall".
Why is gravity not a real force?=20
Category: Physics Published: August 5, 2022=20 https://www.wtamu.edu/~cbaird/sq/2022/08/05/why-is-gravity-not-a-real-force/
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