On May 5, 11:36 pm, "El Enrrabadore-mor"
wrote:
"Darwin123" escreveu na ...



On May 5, 8:10 pm, "El Enrrabadore-mor"
wrote:
"Darwin123" escreveu na
...

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.
The centrifugal force only exists in an accelerated reference
frame, as defined by Newton. Newton describes an absolute space and
time, which means a coordinate system where his three laws apply.
Alas, centrifugal force does not exist in this coordinate system.
Because it doesn't exist in the absolute coordinate system, it can't
balance the centripetal force.
Another way to look at it is to ask yourself the following
question. What object in the universe is applying that centrifugal
force? In the case of earth orbiting the sun, I know what object is
applying force to the earth. The object applying centripetal force to
the earth is the sun, by means of its gravitational field. In fact, I
can say that the centripetal force is the gravitational force of the
sun. However, I can't say the same for the centrifugal force. What
object is applying centrifugal force to the earth? There is no such
object.
I'll take the epistemological view that only observers in an
inertial frame experience "real" forces. from that point of view,
there are no real forces. Because if an observer is in an inertial
frame, he can't experience a centrifugal force. If you break your head
in an motorcycle accident, obviously you are not in an inertail frame.
You were in an inertial frame until you hit your head.
In any case, learn some Newtonian physics before you start
praising him. The best praise for Newton is learning his theory.
Calling him infallible without knowing the caveats to his theory is
false praise.
To put it another way, don't hide behind Newton or Galileo. Name
dropping won't make your arguments any stronger.