Newton discovered that there is a force of attraction (the famous "Law of Universal Attraction"). Einstein has overturned this force (they can say in Discovery TV, what gravity is not a force, but only an effect of the curved geometry). How can one cancel a physical object - the force (word "object" is from the word "objectivity")? The theory of the curved space-time does include the Newton as the special case. But to offend Newton by overturning the force of gravity is like making very strange revolution in Science. The fairytale of some sort. According to Einstein's math, the heavy object is flying in zero gravity, so its acceleration is zero according to Einstein. Formula of geodesic motion gives that, and not me to blame. But the "free fall acceleration" (school's g=9.8 m/s^2) is clearly observed to be not zero. For one scientist (S. Hawking) the Einstein is genius, for another (V.Katyuschik) - the genius one is Newton, but for me - Life is like the real fairytale.
Dear friends in my little community, yes, you two!, please give me pleasure today: vote up this question.
It is simple, the covariant derivative of velocity is not the acceleration. It is measured by the accelerometer and is measured in "g"-s. It is the overloads. The acceleration [measured in m/s^2] is measured by looking at trajectory.
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