"Darwin123" escreveu na mensagem
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On May 5, 8:10 pm, "El Enrrabadore-mor"
wrote:
"Darwin123" escreveu na
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Your problem is that you don't know ANY physics, including
Newtonian. Learn Newtonian physics and get back to me.

OK, Darwin, I promise I will study Newton one day.
I'm only 17 Years old, you know... I'm a liar too.
When I grown up I'm going to be a relativistic
rocket ship constructor, you know?

Thanks for explaining me Physics, specially that
centrifugal force doesn't exist.
I'm going to pick my friend motorcycle (100CV)
and I'm going to make the coffee turn (a 90 degrees
curve) at 250 Km/h. No problem, it doesn't exist.

Make sure you have enough centripetal force, though. Centripetal force
does exist. If you don't have enough centripetal force, you won't make
that coffee turn. You will go in a straight line which will intersect
a wall. Then you will be dead. So make sure about that centripetal
force.

All right Darwin.
To have that centriptal force you're talking about,
required to balance a new born centrifugal force,
you need a fixed point, with infinite rigidity, at the center
of rotation.
When such point exists, the centrifugal force exists.
When there's no such point, the mass becomes a rocket
and no centrifugal force exists, nor it makes any sense
to exist, nor we have any means to suspect that it
could possibly exist. You will go in a straight line,
as you said.

The Sun could be taken as a fixed point in space,
(with very high accuracy, since the Sun moves only
a very small distance in the process) so that Earth
experiences a centrifugal force. That was exactly
what Newton explained in Principia.
Einstein called it free-fall, based on the Equivalence
Principle.