Curved Spacetime
Einstein extended his Special Relativity theory to include gravitation and nonuniform motion.
Einstein was intrigued by the fact that the two ways of measuring mass come up with the same
value. In
Newton's second law of motion
, an object's mass is measured by seeing how much it
resists a change in motion (its
inertia
). In
Newton's law of gravity
, an object's mass is determined
by measuring how much gravity force it feels. The fact that the two masses are the same is why
Galileo found that
all things will fall with the same acceleration
.
Part of Einstein's genius was his ability to look at ordinary things from a whole new perspective
and logically follow through on the consequence of the insights he gained from his new
perspective. He proposed an experiment involving two elevators: one at rest on the ground on the
Earth and another, far out in space away from any planet, moon, or star, accelerating upward
with an acceleration equal to that of one Earth gravity (9.8 meters/second
2
). (Modern readers can
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 Fall '10
 EmilyHoward
 Astronomy, Space, General Relativity, Special Relativity Theory, upward accelerating elevator

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