Work Cited
~ Physical Science: Concepts in Action (Prentice Hall) North Carolina
~ http://physicslessons.com/demos.html
~ http://www.buildings.com/ArticleDetails/tabid/3334/Default.aspx?ArticleID=5436
~ http://physicslessons.com/demos.html
~ http://www.buildings.com/ArticleDetails/tabid/3334/Default.aspx?ArticleID=5436