====== Epicylic Wheel ======

{{tag> circular_motion untagged unlocated}}

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===== Description =====

By turning on the flashlight and rotating the wheel, it will simulate epicyclic motion.





===== Purpose =====


A very simple demo useful for demonstrating epicyclic motion.      



===== Apparatus =====



===== Setup =====


1. The bicycle wheel has a flashlight mounted to the  SIDE of the wheel (that is, the flashlight's beam will point  along the angular momentum axis of the wheel). The light should face towards the audience. 
2. With the instructor stationary, spin the wheel and hold the axis of the wheel so that  the class sees the flashlight moving in a circle (pointing out into the  audience)  
3. Walk across the front of the lecture  hall (maintaining the flashlight always pointing 'out into the  audience') to illustrate that sometimes the light appears to  be moving to the right, and sometimes to the left (retrograde).  
4. The fraction of time retrograde depends on the wheel's rotation  rate relative to the walking rate.  

Edited: Jan 18th, 2016

===== Notes =====



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| **Location** | ---- |
| **Maker** | Unknown |
| **Current State** | Working |
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