In the formula F=ma force is related to acceleration.
If acceleration exists in all references, the force is real, otherwise,
if it exists in one reference and "disappears" in the other, then the
force is "apparent".
On the other hand, in the formula F=m1*m2/d^2 there is NO acceleration
and this is the difference between the second formula and the previous
one.
In F=m1*m2/d^2 the force depends exclusively on the presence of the two masses m1 and m2 (which always exist) and on the square of their
distance (which always exists).
Therefore, if the masses m1 and m2 and the distance d^2 never disappear
(in any reference) the force F=m1*m2/d^2 is always real.
And what is the force F=m1*m2/d^2? It's gravity.
So gravity is not "apparent" because (the formula says so and not me)
its force does not disappear by changing the SDR.
In the formula F=ma force is related to acceleration.
If acceleration exists in all references, the force is real, otherwise,
if it exists in one reference and "disappears" in the other, then the
force is "apparent".
On the other hand, in the formula F=m1*m2/d^2 there is NO acceleration
and this is the difference between the second formula and the previous
one.
In F=m1*m2/d^2 the force depends exclusively on the presence of the two masses m1 and m2 (which always exist) and on the square of their
distance (which always exists).
Therefore, if the masses m1 and m2 and the distance d^2 never disappear
(in any reference) the force F=m1*m2/d^2 is always real.
And what is the force F=m1*m2/d^2? It's gravity.
So gravity is not "apparent" because (the formula says so and not me)
its force does not disappear by changing the SDR.
In the formula F=ma force is related to acceleration.
I always write this formula as a=F/m in order to stress the fact that if a force F acts on a body/particle of mass m, then the particle will get an acceleration a given by a=F/m. This is the Newton's second law.
F is the CAUSE (of the acceleration) and a is the EFFECT. I put the effect
on the left hand side, and the cause on the right hand side,
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