1. To run the simulation, you will need to have Java version 1.4 or later on your computer. This is available for download free of charge at http://www.java.com/en/download/manual.jsp.
2. Please note that if you are working on a Macintosh computer, the version of Java used should be 1.4.2 or later. The simulation program will not work on 32-bit Macs running Mac OS 10.5. Please refer to this PDF document on Mac Related Issues.
3. Download the exercise onto your computer by clicking on the link below.
4. Unzip the archive to your directory of choice and launch the interactive by double clicking on the .jar file.

click here to download the simulation