The Newtonian equivalence principle. It states that gravity is indistinguishable from any other form of acceleration. Roland E ö tv ö s 1848-1919. Hungarian physicist. He studied the Earth’s gravitational field.
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It states that gravity is indistinguishable from any other form of acceleration.
Therefore, if the magnitude of the Coriolis force (centrifugal force due to the Earth rotation) and gravity had been different for the two bodies due to their different compositions, Eotvos would have detected a twisting of the wire. None was seen.
His experiment, performed in 1889, proved that the gravitational mass is proportional to the inertial mass up to 8 decimal figures ( not just 4 decimals as was known before): accuracy of 1/200 000 000.