Relativity
PIRA classification 7F
7F10. Special Relativity
PIRA # 
Demonstration Name 
Subsets 
Abstract 
7F10.05 
Gravitational surface 

see 8C20.20 
7F10.10 
Lorentz transformation machine 
pira1000 
A machine shows the behavior of clocks and measuring rods in two reference frames. 
7F10.20a 
Flow ripple tank 
pira1000 
Wave propagation upstream and downstream is shown with a flow ripple tank. 
7F10.20b 
Flow ripple tank  twin source 
pira1000 
Twin source interference in a moving medium is demonstrated with a flow ripple tank and variable phase generator. 
7F10.25 
Foam rubber roller 
pira1000 

7F10.26 
Fitzgerald contraction model 

A stick traveling at constant velocity makes a traveling dimple in an elastic sheet. 
7F10.30 
Time dilation simulation 

A folding carpenters ruler is used to simulate the effects of time dilation in a "bouncing light pulse clock". 
7F10.31 
Time dilation  twin paradox 

An explicit formula for differential aging from acceleration. How do clocks, initially synched in the laboratory frame, fall out of sync as their speed relative to the lab increases. 
7F10.32 
Relativistic length contraction 

The "pole in a garage" paradox is demonstrated using a collapsible pointer and two cardboard boxes. Simple diagrams for representing relativistic length contraction and time dilation. 
7F10.35 
induction coil relativity 

On using the simple induction coil and galvanometer as a special relativity demonstration. 
7F10.40 
Computer relativistic phenomena 

The Edwin F Taylor Spacetime Software is used to generate printouts demonstrating aberration, the Doppler effect, the headlight effect, etc. 
7F10.41 
Many colored relativity engine 

The author's review of a simple program about relativistic space and time that requires no knowledge of physics, algebra, or geometry. 
7F10.50 
Cylindrical relativity model 

A spacetime diagram rolled on a cardboard tube is used to demonstrate the nature of simultaneity and the propagation of light in a rotating coordinate system. 
7F10.55 
Geometrical appearances 

Some examples are illustrated in detail. 
7F10.60 
Lorentz transformation / time dilation 
pira200 
The Mechanical Universe, chapter 42, and the Hewitt film "Relativistic Time Dilation". https://www.youtube.com/watch?v=feBT0Anpg4A 
7F20. General Relativity
PIRA # 
Demonstration Name 
Subsets 
Abstract 
7F20.01 
General relativity primer 

A tutorial article 
7F20.10 
Film loop review article 

Two film loops, "Uniformly Accelerated Reference Frame", and "Twin Paradox", are thoroughly reviewed. 