FORS-2107EL Study Guide - Quiz Guide: Centrifugal Force, Meat Tenderizer, Blood Residue
27 Jun 2018
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Quiz 1: Bloodstain Summary
Experiment 1 and 2: Drop Size
-The larger the height/volume, the larger the drop size
-The larger the velocity, the smaller the drop
-Height:
-The higher the source, the larger the drop size
-Satellite drops are more present in higher distance
drops because the terminal velocity of the drop
allows for the surface tension of the blood to be
exceeded in the dispersion stage of impact
-Volume:
-The smaller the source of blood, the smaller the
volume and the smaller the drop sizes
Experiment 3: Size Texture
-The type of surface on which a bloodstain will be presented will have a different
appearance, based on the smoothness/texture of that surface and how the blood may
be absorbed treated when it comes into contact with the surface
-Smooth surface:
-Less satellite, spattering and spines
-Rounder drops
-Rough surface:
-More satellite, spattering and spines
-More elliptical shaped drops
Experiment 4: Impact Angle
-The smaller the angle (measured from the ground
up), the more elliptical the shape of the drop
-A larger angle (up to 90 degrees) created a more
rounded, and less elliptical drop
-The tail on the drop (dot on the !) will point to the
direction of movement
Experiment 5: Bloodied Object
-Depending on the amount of blood present on the object, and where the blood falls
on the object, the appearance of the object can be determined (eg. meat mallet,
hammer, etc)
-Some tools, such as a gun, may be difficult to identify (this depends on the make of
the gun, and the amount of blood and transfer surface)
find more resources at oneclass.com
find more resources at oneclass.com
Document Summary
The larger the height/volume, the larger the drop size. The larger the velocity, the smaller the drop. The higher the source, the larger the drop size. Satellite drops are more present in higher distance drops because the terminal velocity of the drop allows for the surface tension of the blood to be exceeded in the dispersion stage of impact. The smaller the source of blood, the smaller the volume and the smaller the drop sizes. The smaller the angle (measured from the ground up), the more elliptical the shape of the drop. A larger angle (up to 90 degrees) created a more rounded, and less elliptical drop. The tail on the drop (dot on the !) will point to the direction of movement. Depending on the amount of blood present on the object, and where the blood falls on the object, the appearance of the object can be determined (eg. meat mallet, hammer, etc)
