Gravitational pull is the invisible force that causes massive objects to pull other objects towards them. For instance, when a person jumps up in the air, it is the earthâs gravitational pull... Gravitational pull is the invisible force that causes massive objects to pull other objects towards them.
Audacity is a free, easy-to-use audio editor and recorder for Windows, Mac OS X, and GNU/Linux. You can use Audacity to: 1  Record live audio; 2  Cut, Copy and Paste, Delete, Duplicate, and Split audio files; 3  Change the speed, pitch or volume of a recording; 4  Apply effects to any part of the sound; 5  Align audio segments.
Audacity is also a sound editor. You can edit the sound there. Once you have the MP3 file, insert it into PowerPoint as follows: 1  Move it into the same folder as your presentation. 2  Display the first slide.  Choose Insert > Movies and Sounds > Sound from File. Choose the file and click Insert.