20. Relativity Films

Two good films for relativity are "Frames of Reference" and "Time Dilation". The first is an excellent older film lasting for 30 minutes showing experiments in Galilean relativity filmed from different points of view, the laboratory frame, uniformly moving, accelerated, and rotating frames. Paul Hewitt's Time Dilation film lasts about 15 minutes and resolves the twin paradox by the Darwin method, counting light signals emitted at regular intervals by the other twin. A description of the twin experiment and calculation of the times is repeated in Hewitt' s book, Conceptual Physics.

Also available are the highly instructive Mechanical Universe series on relativity chapters 42 and 43.