Basic story, without math
Coriolis effect related
General physics: rotation
Created with EJS
The physics of rotation
Welcome to my website featuring the mechanics of rotation.
Much of the content of this site is illustrated with animations. Rather than conveying the physics with formula's and equations I'm using mathematically correct animations. I do present equations and formula's, but only later on in the articles, after laying down a good understanding.
My purpose is to complement existing sites and existing physics textbooks. What I see in existing material is that the physics of rotation is discussed in an abstract, mathematical way. I want to create a vivid understanding, a 'seat of the pants' understanding.
In writing a site like this I had to decide what level I want to aim for. I assume some familiarity with physics. I would have overburdened the articles if I would have tried to spell everything out for novices.
In addition to the animations illustrating the articles I have some simulations, which are on separate pages. The simulations were created using EJS, an open source tool for creating models.
Let me walk you through the various groups of articles that you see in the navigation column on the left.
Coriolis effect related
The article Coriolis effect in Meteorology offers a basic discussion, without using any mathematics.
The articles about the Eötvös effect and Coriolis flow metering deal with relatively simple manifestations of the Coriolis effect, but since they are not suitable as starting material I have placed them at the rear.
The 'Coriolis in meteorology' article is now also available in French. L'effet Coriolis en météorologie. A visitor, Damien Belliard, who has a meteorology website himself, offered to translate the article, which I gratefully accepted. I can read French fairly well, so I'm happy to publish the translation on my own website.
Articles about subjects that are obviously rotation related, such as conservation of angular momentum, but not directly Coriolis effect related
Quantity of motion
Least action visualized. In classical mechanics the work-energy theorem and the principle of least action are mathematically equivalent. The purpose of the article is to demonstrate that with vivid, visual means.
The Sagnac effect
The Sagnac effect falls in the 'physics of rotation' category, but I present it separately. The other articles about the physics of rotation involve only mechanics; the Sagnac effect is a case of wave mechanics; interferometry. Much of the Sagnac effect article deals with a very special case of the Sagnac effect: ring laser interferometry. The rotation effect that is involved in ring laser interferometry is quantummechanical in nature.
In those articles I discuss very general concepts, dealing with the foundations of theory of motion. I recommend reading the Apparent motion and Inertial coordinate system articles before reading the articles about relativistic physics.
Special relativity and General relativity are essays. The information in these essays is very condensed. The purpose is to widen the reader's perspective and provide food for thought. The essays are not introductions, they are intended for readers who have consulted other resources before and will continue to do so. The essays do not contain any mathematics in the form of equations; all the abstract concepts are conveyed with animations and diagrams.
Relativistic physics has been around for a hundred years now, but the understanding of relativistic physics is still evolving. The essays here are inspired by developments of the past couple of decades.
Simulations created with EJS.
Ballistics and orbits
Angular acceleration of a contracting system
Spacestation vertical throw
As you will have noticed, I'm referring to the material on my site as 'articles'. The layout of this site is inspired by Wikipedia. In particular I have copied the way that images are displayed on Wikipedia.
I like to think of my material as as entries in an encyclopedia. It's presentation of background material rather than teaching a course.