Reality Of Gravity

Reality Of Gravity

Gravitation is not a force, but a
property of spacetime.

According to Einstein, not only
are time and space relative, but
the geometry of space is
different from what we
experience in daily life.
Hyperspace is a mathematical
construct that we can use to
describe gravitational effects in
terms of geometry, rather than
by the postulation of attracting
and repelling forces.

Einstein arrived at this idea by
looking at gravity and
acceleration. He thought that a
falling object does not "feel" any
gravitational force, while an
object being accelerated does.
For this reason, he suggested to
equate gravitational mass with
inertial mass. He postulated that
if a frame of reference is
uniformly accelerated relative to
a Galilean one, then we can
consider it to be at rest by
introducing the presence of
uniform gravitational field
relative to it. This is known as the
principle of equivalence.