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===== Length Contraction: Instructor's Guide =====

==== Main Ideas ====

  * Length contraction is just the result of different observers making different measurements.
  * Spacetime diagrams can be calibrated using hyperbolas.

==== Students' Task ====
//Estimated Time: 30 minutes, including wrap-up//

Students should be asked to answer the following questions on their
whiteboards:\\\\
//
Draw a diagram showing a meter stick on a moving train.\\\\
Draw a diagram showing a meter stick at rest.\\\\
Calibrate these diagrams using unit hyperbola.
//

==== Prerequisite Knowledge ====

Basics of hyperbola geometry.

==== Props/Equipment ====

  * [[:Props:start#whiteboards|Small whiteboards]] with markers

==== Wrap-Up ====

  * Ask several students to present/defend their responses.
  * Construct right triangles with unit hypotenuse in both reference frames, emphsasizing the location of the right angle.