Physics To Go is an online monthly mini-magazine and a collection of more than 950 websites with physics images, activites, and info. You can view an archived version of our June 9, 2011 issue, Chaos below, or click to see our September 1, 2013 issue, Two views of Earth.

Physics in Your World

Chaotic Pendulum image
image credit: Amy Snyder, © Exploratorium; image source; larger image

Chaotic Pendulum

The photo above shows a three-way double pendulum at the Exploratorium, and you can see a video about this exhibit at Chaotic Pendulum. (A double pendulum is essentially one pendulum hung underneath of another--see this diagram.) In general, the motion of this pendulum is chaotic.

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Physics at Home

Double Pendulum Model

For a simulation of the double pendulum, click here; then, in the new window, click on "download ejs mech..." and then click on the "Double Pendulum" window. Get the double pendulum started by clicking and dragging the two masses to different heights.


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Worth a Look

Chaos and Fractals

Serious study of chaos began with Edward Lorenz's simplified three-equation model of the atmosphere. Visit Chaos and Fractals for a brief overview of chaos theory, including how Lorenz discovered "sensitive dependence on initial conditions", also known as "the butterfly effect." When he discovered this, he knew that long-range weather forecasting would never succeed.

(This feature was updated on September 2, 2013.)


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