28.3 General Relativity

Relativity and the Speed of Light

An introduction to relativity followed by a discussion on how it is that the speed of light remains constant no matter what your frame of reference. Duration: 10:21.

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Principle of Equivalence

Is gravity truly a force, or is it what we experience when mass has the effect of warping both space and time? Duration: 6:40.

Gravitational Time Dilation

The effect that acceleration and mass have on the passage of time is explored. Duration: 8:32.

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Special Relativity

Uniform motion can only be measured relative to some external reference. This is discussed followed by three space-traveling thought experiments. Duration: 10:20.