Spatter Definition What is impact spatter A blood stain produced when an object makes forceful contact with a source of blood projecting blood outward from the source Why do we care Why is impact spatter important ID: 408145
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Slide1
The Science of Blood SpatterSlide2
Spatter Definition
What is impact spatter?
A blood stain produced when an object makes forceful contact with a source of blood, projecting blood outward from the source.Slide3
Why do we care?
Why is impact spatter important?
What information can we find out using impact spatter patterns?Slide4
Why do blood spatters look different?Slide5
Dropping blood from different heights
Predict the impact spatter pattern from high and low heights.
Observations?
Why?Slide6
Airtrack Demo
Predict what will happen:
What observations did you make?
Uneven masses?
Predict what will happen:
What observations did you make?Slide7
Spatter at different velocities
What if we keep the spatter at the same height, but vary the speed?
Predict what a blood droplet will look like if dropped from the same height if:
V
forward
= 0 (at rest)
V
forward
=
walking
Vforward = runningBe ready to explain your predictions. . . Slide8
Spatter at different velocities
For
V
forward = 0 (at rest
), draw the path of a single droplet (side view)
For
V
forward
=
walking, draw
the path of a single dropletFor Vforward = running, draw
the path of a single dropletSlide9
Angle of Impact
Slide10
Spatter shape and Angle of Impact
Demo: water balloon
Predict how the angle of impact will affect the length of the spatter.
Predict how the angle of impact will affect the width of the spatter.Slide11
Angle of Impact
Predict the angle of incidence for each of these drops from highest angle to lowest angle. Slide12
And now for Prelab
!
Read the Lab: Dropped at the Scene
On a piece of paper
record variables
answer questions
graph on graph paperSlide13
Angle of Impact