In Dr.Einstein's theory of General Relativity-- he goes to great lengths to explain how the force of gravity is merely an illusion and in the case of the falling apple-- it is the earth accelerating to meet the apple's inertial frame. But it is well known that gravity is one of the four fundamental forces. I would like to know the reason for this apparent contradiction. Is it or is it not a force?
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You might be interested to read how-we-know-gravity-is-not-just-a-force – timm Dec 31 '18 at 15:17
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Possible duplicates: https://physics.stackexchange.com/q/61899/2451 , https://physics.stackexchange.com/q/219306/2451 and links therein. – Qmechanic Dec 31 '18 at 15:22