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In Newton's theory, all three of these masses - the inertial mass, the active and passive gravitational masses - are equivalent.
Photons, according to the special theory of relativity, move in vacuum with the same speed in all inertial frames of reference.
Inside is a guidance control unit with inertial navigation and global positioning systems.
Einstein warmed to the idea that the gravitational field of the rest of the Universe might explain centrifugal and other inertial forces resulting from acceleration.
The interesting thing is that, physically, no difference has been found between gravitational and inertial mass.
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