Blood Splatter Investigation_Version two.docx - Cameron-eportfolio

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```					BLOOD SPLATTER EXPERIMENT

AIM:
To determine how the height at which blood is spilled affects the size of the
splatter

HYPOTHESIS:
If the blood is dropped from a higher level then the blood stain itself will be
larger because of the increased velocity which creates a higher impact force
according to Newton’s second law, force is equal to mass times acceleration.

VARIABLES:

INDEPENDENT VARIABLE: Height that the blood is dropped from

DEPENDANT VARIABLE: the size of the stain that blood creates

CONTROL VARIABLES: the method that we use to drop the blood, the mixture
used as the blood, the room that we are in, the surface which the blood is
dropped onto

MATERIALS:

Chemicals:
 40mL corn syrup
 20mL water
 3.75Ml-6.25Ml red food colouring
 1 drop green food colouring
 11 g corn starch

Apparatus:
 600 mL beaker
 Mixing implement (stick)
 Surface to drop blood on
 Ruler
 Measuring tape
 Pipette

METHOD:

1. Get materials
2. Combine the 11 g of cornstarch with the 20mL of water
3. water until a homogenous mixture has been produced
4. Add 40mL corn syrup into the mixture and stir well
5. Put 1 teaspoons of red food colouring into the mixture
6. Add 1 drop of green food dye. If the mixture is to light, add more red food
dye.
7. Measure the height which you want to drop it from
8. With the pipette take 1ml of blood and drop one drop
9. Drop the fake blood
10. Measure the splatter
11. Collect the data
12. Repeat two more times
13. Repeat steps 6-11 until you have enough data to draw a conclusion

DATA TABLE:
HEIGHT DROPPED              DIAMETER OF THE    DIAMETER OF THE                DIAMETER OF THE
FROM                        SPLATTER (cm)      SPLATTER (cm)                  SPLATTER (cm)
0.5 meter                   1.1                1.6                            0.9
1 meters                    1.6                           1.5                 1.2
1.5 meters                  1.6                           1.5                 1.4
2 meters                    1.7                           1.18                2.0

Diameter of the Splatter(cm)
2
1.8
1.6
1.4
1.2
1
0.8                                                   SPLATTER (cm)
0.6
0.4
0.2
0
0.5     1 Meter    1.5     2 Meters
Meters             Meters

ANALASYS OF DATA:
From the data here we can see a steady growth in the size of the blood splatters
with relevance to the height that it is dropped from. By following Newton’s
second law we can determine that this effect would continue until you reach a
height where the liquid could reach terminal velocity. After you reach that height
there would be no changes in size.
CONCLUSION:
From our experiment it seems that we have proved our hypothesis to be correct.
From 0.5 meters to 2 meters there seems to be a fairly steady growth in the size
of the diameters of the splatters we dropped. Although many factors such as the
ground we dropped the fake blood onto (which had quite a bit of dust and mud
on it which could absorb some of the fake blood) and the slight inaccuracies in
the heights which we dropped the blood from may have had an effect on the
result, I still find that the evidence does support our hypothesis as these factors
would most likely have only made small differences in the outcome of our
experiment

SOURCES:

"Fake Blood Recipes." Www.clt.uwa.edu.au/_data/page/112508/fsb06.pdf. University

of Western Australia. Web. 14 Mar. 2012.

<www.clt.uwa.edu.au/_data/page/112508/fsb06.pdf>.

"Index." Maverick Experiments. Web. 26 Mar. 2012.
<http://www.maverickexperiments.com/fma/Force.html>.

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Zhengqin Wu