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"A parametric study is undertaken to predict patterns of backward blood spatter under realistic conditions corresponding to the experiments conducted in the present work.The results of the model are compared to the experimental data on back spatter generated by a gunshot impacting a blood-impregnated sponge." ~ APS] As you may be able to imagine, determining how a droplet of blood traveled through the air when considering air resistance and any other outside effects is rather difficult.
From this point, the technician would attach a string to major drops in the direction each drop was believed to have landed.
After repeating this action enough, the strings converge in one general area, giving the location of the victim when the crime was committed.
The end result has to be an accurate enough play by play of the crime to hold up in court.
For a long time, forensic science has been an inexact art, but now a team of physicists is bringing concrete physics into the picture.
Whether you’re an up and coming forensic analyst or just someone who can’t get enough of CSI, chances are you have heard a thing or two about blood spatter analysis.
This field involves using the physics of fluids to help to determine the events of a (usually) violent crime by analyzing the placement of the blood droplets at the crime scene.A quick web search for software compatible with the operating system of your computer will reveal many options. Open the photo analysis software and import your photograph into the program. Establish the scale for your photograph using the protractor.This is done by clicking and dragging across one inch of the protractor scale visible in the photograph and entering the length of that region as one inch, then repeating for a vertical portion of the protractor that you can measure and then enter to establish a scaled distance. Set the units of measure you wish to use for your measurements. Click and drag across any distances you want to measure, such as diameters of blood droplets, lengths of blood trails, etc. One rubric I use if students have an opportunity to research the analysis of blood splatter before beginning their investigation, and the other is a shorter form if time did not permit that time for background research.depending on the research question you are attempting to answer. After completing their investigation the students will have their analysis of their own blood splatters and the crime scene. For example, how is the diameter of the droplet affected by the height from which the droplet is released. Add text annotations to the photograph to explain the known blood splatter patterns were created. I monitor their progress but I did not offer advice or steer them towards any particular approach.After the class has completed their investigations we discuss the positive contributions from each group, and also what each group could have improved to get better or more complete results.This is a lesson I use to introduce my physics students to the process of scientific investigation including writing a problem statement, generating a hypothesis, collecting and organizing data, analyzing data, writing a conclusion that is supported by data, and communicating results in a lab report.It also serves as a motivational activity to get students excited about investigating the world around them.Students should also explain each calculation in their data analysis and make certain that their conclusion provides a clear link between the data collected, the analysis, and the proposed explanation of what transpired at the crime scene.As students begin to brainstorm, different groups will develop different approaches to the problem such as measuring drops from different heights, different types of motion, and/or drops landing on boards placed at different angles.