Physics and Math Notes
- Physics and Math Notes by Jed Chapin
- Questions and comments welcome: jed@islandnet.com

- Differential Geometry

- Electrodynamics

- Miscellaneous
- Rotational Dynamics

This presentation of 3d rotations is based on the rigid-body chapter in Goldstein's "Classical Mechanics". I replaced ideas involving infinitesimal rotations with derivatives. There is some bumpy and exhausting math but I hope the reader gets a better understanding of tumbling objects. Possibly read Appendix K at the end for inspiration (or intimidation).

Really good rotations video

- Electrodynamics and Special Relativity

This note is aimed at students with a high-school level understanding of special relativity. The message is that the relativistic effects on space and time are no more surprising than electromagnetism. I heard this somewhere but don't have a reference and don't know if it is true.

- Asymmetry of the Twin Paradox

I think I read something like this once upon a time.