Relativity


Escher's Relativity

“Everybody knows that Einstein did something astonishing, but very few people know exactly what it was. It is generally recognized that he revolutionized our conception of the physical world, but the new conceptions are wrapped up in mathematical technicalities. It is true that there are innumerable popular accounts of the theory of relativity, but they generally cease to be intelligible just at the point where they begin to say something important.”
(Bertrand Russell in ABC of Relativity)


The videos below will help you to understand the Einstein's Theory of Relativity.



Learn about the Einstein's Theory of Relativity watching these videos.



Learn about time dilatation according to Einstein's Theory of Relativity.
















Computer animations on Relativity:
Michelson-Morley Experiment
A simple analogy involving two swimmers that sets up the Michelson-Morley Experiment. Requires Flash 6; file size is 15k.
Time Dilation
A demonstration that the phenomenon of time dilation from the special theory of relativity necessarily follows from the idea that the speed of light is the same value for all observers. Requires Flash 6; file size is 55k.
Deriving Length Contraction
A tutorial that shows how relativistic length contraction must follow from the existence of time dilation. Requires Flash 5; file size is 37k.
Length Contraction is Invisible
This series of animations demonstrates that the relativistic length contraction is invisible. Requires Flash 5; file size is 90k.
Deriving the Relativity of Simultaneity
A tutorial that shows how the relative nature of the simultaneity of two events must follow from the existence of length contraction. Requires Flash 5; file size is 39k.
Twin Paradox
There are many ways of approaching this classic "paradox". Here we discuss it as an example of the relativistic Doppler effect. Requires Flash 6; file size is 116k.
Foucault Pendulum and Mach's Principle
This began as an animation of the Foucault Pendulum, but then I generalised it to illustrate Mach's Principle. See also the simple Foucault Pendulum in the Classical Mechanics section. Requires Flash 6, file size is 1.5M.
Advance of the Perihelion
A simple animation showing Newton's and Einstein's predictions for the orbit of Mercury. Requires Flash 6; file size is 7.0k.