Name _____________________________________________
Partner(s):___________________________________________
Date_________________
Blood Spatter Labs
Lab Notes:
•
You will be creating sample drop patterns using single drops and multiple drops. We
will also investigate the effect of motion and the angle of impact on blood spatter.
•
This can be messy! Be very careful to keep the blood on the paper and not on yourself,
the table, or floor.
•
Hold your hand as steady as possible when making the drops. Brace your wrist against
the meter stick to help you.
•
Get your materials from your teacher – paper, black marker, meter stick, goggles, and a
bottle of blood.
•
If you make a mess, clean it up immediately!
Name _____________________________________________
Partner(s):___________________________________________
Date_________________
Lab 1: Fill in the table below with your results:
Height of
Drop (cm)
Diameter
Drop #1
(mm)
Diameter
Drop #1
(mm)
Diameter
Drop #1
(mm)
Average
Diameter of
Drops (mm)
Drop Sketch
&
Observation
25
50
75
100
125
Lab 1: Use your results to answer these questions.
1) What did you notice about the diameter of the parent droplets as you increased the height
of the drop?
2) How do the spines compare from the different heights?
Name _____________________________________________
Partner(s):___________________________________________
Date_________________
Lab 2: Use your results to answer these questions.
1) What happened when one drop landed on top of another one?
2) What did you notice about the diameter of the parent droplets as you increased the height
of the drop?
3) What do you notice about the diameter of the satellite spatter as you increased the height of
the drop?
Name _____________________________________________
Partner(s):___________________________________________
Date_________________
Lab 3: Use your results to answer these questions.
1) Draw a sketch of the droplets showing the size, shape, and/or distance between them at
each speed in the chart below.
Name _____________________________________________
Partner(s):___________________________________________
Date_________________
2) What did you notice about the shape of the droplets as you increased your walking speed?
3) What did you notice about the spines as you increased your walking speed?
4) What did you notice about the distance between the droplets as you increased your walking
speed?
Name _____________________________________________
Partner(s):___________________________________________
Date_________________
Lab 4: Fill in the table below with your results:
Angle (⁰)
15
30
45
60
75
Length of Drop
Max. Width of Drop
Sketch of Drop
Name _____________________________________________
Partner(s):___________________________________________
Date_________________
Lab 4: Use your results to answer the question.
1) What did you notice about the shape of the droplets as you increased the angle of the
paper?
2) How does the angle of impact of a droplet influence its shape?
3) As the angle decreases what happens to the relationship between length and width of the
bloodstain?
4) Do you think you will be able to determine the angle that the droplet came from based on
the bloodstains?
5) As the angle of impact changes, are more satellite stains or spines produced? Why?