1. I can view simulation at http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=693.0 without any problem .
May be you can try it again. Or you can click "get file for offline use" button, download the jar file, double click it to run the simulation locally.
2. You are welcomed to check out related simulation: [url=http://www.phy.ntnu.edu.tw/ntnujava/index.php?topic=190.0]Circular motion in vertical plane [/url]