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If I partially fill a bucket with water the and rotate it so that the water also rotates the water will climb up the sides of the bucket and become depressed in the centre.why does this happen, there is no aether so what am I rotating it relative to, is it the local gravitational field of the Earth, the Solar system, the Galaxy, the whole universe or that of the sea of dark matter in which we are immersed.

I would have thought this is due to centrifugal force.

Quote from: webplodderI would have thought this is due to centrifugal force.It is and you are correct. See reply #1.

Centrifugal force !!! what the hell is that !! rotation can only be relative are you saying the Universe is not isotropic and that there is a preferred direction against which things can be rotated I thought Einstein got rid of that idea long ago.

Can gravitation and inertia be identical? This question leads directly to the General Theory of Relativity. Is it not possible for me to regard the earth as free from rotation, if I conceive of the centrifugal force, which acts on all bodies at rest relatively to the earth, as being a "real" gravitational field of gravitation, or part of such a field? If this idea can be carried out, then we shall have proved in very truth the identity of gravitation and inertia. For the same property which is regarded as inertia from the point of view of a system not taking part of the rotation can be interpreted as gravitation when considered with respect to a system that shares this rotation. According to Newton, this interpretation is impossible, because in Newton's theory there is no "real" field of the "Coriolis-field" type. But perhaps Newton's law of field could be replaced by another that fits in with the field which holds with respect to a "rotating" system of co-ordinates? My conviction of the identity of inertial and gravitational mass aroused within me the feeling of absolute confidence in the correctness of this interpretation.

You might want to read about Newton's Bucket thought experiment. He makes glaring logic errors but it's interesting to think about.

Quote from: AndroidNeoxYou might want to read about Newton's Bucket thought experiment. He makes glaring logic errors but it's interesting to think about.What are these glaring logic errors that you're referring to?