Analyzing blood patterns experts study some of these key variables:
Due to the fact blood is a fluid, the analysis of the splatter can be evaluated with some of the basic laws of physics. These laws are "Newton's Second Law" and "Projectile Motion."
Information for this page used from “Forensic Serology: Bloodstain Pattern Analysis.”
Moving Graphic art used from: http://www.animationlibrary.com/a-l/?n=search.php3&start=0&end=8
Picture of blood splatter used from http://www.bloodspatter.com/News.htm