Bibliography
Luebben, Craig. Rock
Climbing Anchors: A comprehensive Guide. The Mountaineers
Books, 2007.
Walker, Jearl. Fundamentals
of Physics. 8th ed. 2008.
Isaac Newton photo.
<http://www.dkimages.com/discover/previews/741/117081.JPG>
Belay photo.
<http://www.nyise.org/photoblog/rockclimbing/IMG_0244.jpg>
Climbing Shoe photo.
<www.wikipedia.com>
Amanda Green Climbing photo.
Taken by Trina Harrington