Blood Spatter Analysis

What are these? Guess.

My guess: Arterial Spurt (some major artery was severed (not sure if that's the right word heh) and the heart is still pumping so the blood is sprayed on the wall)
My guess: I suppose the big circle at the right is something from a syringe I don't really know what's happening at the left side.
My guess: no idea.

My guess: I seriously have no idea.

Answer these questions!

What is shape of blood splatter?

I suppose it would include, among others, the length/direction of the tail/length of the blood splatter, diameter if it's round

Describe any other characteristic of the splatter.

The surrounding tiny spots of blood, or maybe something like the bottom is like thicker or something cause of gravity.

What are the factors that affect the shape of the blood splatter? Name as many as possible.

- Height (the higher the bigger)

- Angle at which the blood hits the surface

- Direction

- Velocity

- Something about the weapon used? I'm not sure which aspect of the weapon but there's a difference between a syringe and a knife for example.

Generate some hypotheses from the blood splatter patterns observed above.

The greater the height from which blood is dropped, the greater the diameter.

Data Analysis:

Height/cm	Diameter of A/mm	Diameter of B/mm	Average Diameter/mm
10	9	9	9
30	11	11	11
60	13	13	13
100	16	15	15.5
150	15	15	15

The greater the height from which the blood is dropped, the greater the average diameter of the blood spatter produced.

Angle tilted by board/o	Angle of impact	Width (P)/mm	Width (Q)/mm	Average Width/mm	Length (P)/mm	Length (Q)/mm	Average Length/mm	Theoretical Angle of Impact
10	80	11	13	12	11	13	12	90.0
30	60	13	13	13	14	15	14.5	63.7
50	40	12	11	11.5	17	28	22.5	30.7
70	20	8	7	7.5	35	45	40	10.8

I'm still trying to get why is sin-1 (width/length) is the angle of impact. maybe it's cause it's afte rmidnight already. will try to understood soon. Anyway the theoretical angle of impact is not the same as ours; maybe experimental error.

Quad-rio? (whatever you call a group with 4 people) Task

(special thanks to audrey for the monologue and shirley for the camera-ing.)