Deletion of Restoring force

Comment: The nomination does not observe . Critical concept in physics, in mathematics, and in such fields as musical instrument design, and covered in depth in physics textbooks in the section about harmonic motion. See http://books.google.com/books?id=BwistUlpZ7cC&pg=PA360&dq=%22restoring+force%22&hl=en&sa=X&ei=YqntUrHdN8S8qAHwlIC4Dw&ved=0CDcQ6AEwAg#v=onepage&q=%22restoring%20force%22&f=false, http://books.google.com/books?id=MmoiJPsuFW8C&pg=PA4&dq=%22restoring+force%22&hl=en&sa=X&ei=YqntUrHdN8S8qAHwlIC4Dw&ved=0CEcQ6AEwBQ#v=onepage&q=%22restoring%20force%22&f=false, http://books.google.com/books?id=3bbpAAAAQBAJ&pg=PA583&dq=%22restoring+force%22&hl=en&sa=X&ei=YqntUrHdN8S8qAHwlIC4Dw&ved=0CF0Q6AEwCQ#v=onepage&q=%22restoring%20force%22&f=false, http://books.google.com/books?id=l8pYZizoGlcC&pg=PA9&dq=%22restoring+force%22&hl=en&sa=X&ei=YqntUrHdN8S8qAHwlIC4Dw&ved=0CGEQ6AEwCg#v=onepage&q=%22restoring%20force%22&f=false
Stance: keep
Cited policy: Wikipedia:Articles for deletion (WP:BEFORE)