"Frames of Reference", Patterson Hume, Donald Ivey, Educational Services Incorporated 1960.

This 28 minute film, which shows motions of objects as viewed from different frames of reference, should be shown to high school or junior high school students.

"Time Dilation -- An Experiment with μ-Mesons", David H. Frisch and James H. Smith, Educational Services Incorporated 1962.

This 36 minute film, which uses decays of muons to measure relativistic time dilation and length contraction, should be shown to high school students.  Interested teachers and students may read the accompanying article "Measurement of the Relativistic Time Dilation Using μ-Mesons", David H. Frisch and James H. Smith, American Journal of Physics 31, 342-355 (1963).

Lengths of vectors, areas of parallelograms, and volumes of parallelepipeds

As part of geometry and algebra curricula, high school students should be expected to learn how to compute areas of parallelograms and volumes of parallelepipeds.  A parallelepiped is a six-faced volume all six faces of which are parallelograms.  Equations for lengths of vectors, areas of parallelograms, and volumes of parallelepipeds extend to higher dimensions and complex numbers, have many practical applications in science, engineering, and other areas of applied mathematics, and are important connections between geometry and algebra.

More to come ...