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.4 = 24 degree angle 5 0 obj Lay the sponge on the floor about 2 feet from the wall. Make sure the paper reaches the floor and goes pretty high up.
Blood Type Virtual Lab; Once the link opens, click on Blood Typing; You will want your sound on or to plug in headphones. This worked well until they ran across this guy. They take pictures of the blood stains, write down lots of notes, and measure the blood stains that they find. They dust for fingerprints, use special lights to look for blood, use chemicals to find out what mysterious substances are, and sample DNA to figure out whodunit. .6 = 37 degree angle Life's short - make fun of it! K–12 activities.
Traditionally practitioners of blood-pattern analysis trace a straight-line from the stain at the impact angle to reveal where the blood … Note the shape of the spatter, measure the length and width of each drop (don’t include the tail in your measurement), take pictures of the spatter pattern. <>stream Glass, metal, and other smooth, hard surfaces tend to yield blood stains that are rounded. Hard rough surfaces like wood or paper tend to produce blood stains with irregular, jagged edges. Across a drop blood can decide: the DNA pathological diseases, blood group between. .8 = 53 degree angle 3. Explain the properties of blood that allow it to be a key piece of evidence. Drops that hit at an angle form a tail which typically points in the direction that the drop traveled. 2 0 obj When drops of blood hit the floor at an angle, they produce elliptical stains, where their width-to-length ratio gives that impact angle. <>/MediaBox[ 0 0 612 792]/Parent 2 0 R /Resources<>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI]/XObject<>>>/StructParents 0/Tabs/S/Type/Page>>
<> First we will let you in on a little secret. Then set a mousetrap and apply blood to the metal and trip it with a pencil. High-velocity spatter – occurs with gunshot wounds. murder, homicide, sexual crimes, between others. Course Hero is not sponsored or endorsed by any college or university.
May be larger if they are tall or walking on a tightrope.
Tape large sheets of paper on a wall. 1 0 obj Simulated Blood Spatter Supplier: ALDON CORP SE Convenient one liter sized bottle. Medium-velocity spatter – results from attacks with a blunt object (like a bat) or a stabbing or when the injury is close to the surface of the skin and blood spurts out of the wound. Grade Level: 7–12.
Droplets are typically no more than 4 millimeters. %PDF-1.7 Of course two fingers on the side of the neck works well too. Detectives use the knowledge they gain from blood spatter analysis to figure out how the blood pattern was made and hence, how the person who bled was injured, where they were standing when injured, how long ago the crime was committed, and so on.
Can a chopped-off snake head still bite you? Add 2-3 teaspoons of red food coloring and 2 drops of green food coloring. What components of blood can be examined?
One needs to know math, physics, biology and chemistry.
It’s called the “which kid do we smack this time” game. Blood begins to dry and clot within 15 minutes (depending on factors such as heat and humidity). Reeko's Mad Scientist Lab. endobj Here is what the blood spatter pattern would look like on a smooth surface. 1 = 90 degree angle. taken periodically throughout their careers. * c = width of spatter (mm)
Check out Bible Blender for bible study blended with science, history, technology, and your analysis.
Mix 44 g of cornstarch with 80 mL of water. Police use many different scientific techniques to figure out who the bad guy is.
When you or your brother or sister do something wrong, your parents have to figure out who did it. Follow all instructions to complete the activity. .9 = 64 degree angle
= impact angle
Write your findings on an index card. And no, they don’t roll dice or draw straws to figure it out the winner. How dry the blood is gives the detectives an idea of how long ago the attack happened. Parents have an eerie, almost superhero-like ability that allows them to scan human faces to determine the guilty party. See example below. You can hurt yourself with the hammer and screwdriver (which come to think of it, would add a bit of realism to the experiment). Usually found in the used weapon. You can also get the fake blood on your clothes, furniture, or walls which won’t make mom or dad very happy (which come to think of it, could also add a bit of realism to the experiment). The texture of the surface that the blood lands on affects the shape of the blood pattern too and detectives have to take that into consideration. Blood is primarily made of water and as such, it behaves much like water and therefore must obey the laws of motion and gravity.
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