Step is an interactive physics simulator. It works like this: you place some bodies on the scene, add some forces such as gravity or springs, then click "Simulate" and Step shows you how your scene will evolve according to the laws of physics. With Step you can not only learn but feel how physics works !

Create a video having a screen-cast of Physics simulation in Step and upload it to YouTube

To complete this task you need to 

1. Take a screen-cast using RecordMyDesktop
2. Add audio narration
3. Ask for review and upload it on Youtube.

Include as many activities as you can in your video (minimum TWO recommended)

Links:

https://edu.kde.org/step/

http://recordmydesktop.sourceforge.net/about.php