Asimov wrote:

This reminds me of a contradiction I find in Einstein's equivalence
principle. He states accelerating at 1G is the same as being pulled by
the Earth's gravity at 1G. In my opinion, they are similar but they
are not quite the same thing simply because in the former there is
motion and for the latter there is not.

A contradiction which might only appear if you were to confuse little g
and big G. Eistein was referring to the former, which is the
acceleration a falling body experiences as a result of the force of
gravity on Earth - a change of velocity of 9.8 meters per second in one
second. Clearly motion is involved. Big G is the universal
gravitational constant, which is in units of Newton meters squared per
kilogram squared. Clearly, this relates to a force in Newtons which
varies as the square of mass and the inverse square of distance,
according to Newton's law of gravitation. Motion is only involved if
the force is not met with an equal and opposing force - as is obviously
the case when standing on the ground.

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