#  Relativity 

 



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### Relativity Train

\[XL | t++ | ★★★★\]  
Demonstration of time dilation and length contraction gedanken experiment using a train on a track.

\[[In-Depth Description](/presentations/relativity-train)\]

### Bouncing Photon

\[XL | t++ | —\]  
A photon (modeled by a bouncing ping-pong ball) is observed from two reference frames and provides the motivation for time dilation.

\[[In-Depth Description](/presentations/bouncing-photon)\]

### Faraday Induction

\[M | t | ★★★\]  
Reference frames: equivalence of moving the magnet and moving the coil is shown.  
  
\[[In-Depth Description](/presentations/faraday-induction)\]

### Gravitational Lens

\[M | t+ | ★★★\]  
Laser and plastic lens with curvature to simulate bending of light by massive object.  
  
\[[In-Depth Description](/presentations/gravitational-lens)\]

### Gravitational Field Surface

\[M | t | ★\]  
1m diameter rubber sheet acts as curved space for ball bearing masses.  
  
\[[In-Depth Description](/presentations/gravitational-field-surface)\]

### Saddle Shape Universe

\[M | t | ★\]  
Curved space segment for open universe geometry.  
  
\[[In-Depth Description](/presentations/saddle-shape-universe)\]

### Inflating Universe

\[L | t+ | ★★★\]  
Large weather balloon; inflate for two dimensional analogy of the expanding universe.   
  
\[[In-Depth Description](/presentations/inflating-universe)\]

### Spherical Blackboard

\[M | t | ★★★\]  
1m black sphere to draw pretty non-Euclidean diagrams.   
  
\[[In-Depth Description](/presentations/spherical-blackboard)\]

### Relativity Grids

Looking at the principle of simultaneity and inertial frames using two parallel 2-D grids.

### Contact Us

**Mailing Address**: Lecture Demonstration Services, Science Center, Rm B-08A, 1 Oxford Street, Cambridge, MA 02138  
**Campus Location**: Science Center B-08A | **Tel**: (617) 495-5824 | **Email**: scidemos-at-fas.harvard.edu