1 / 23

Today’s Assignments

Today’s Assignments. Blood Typing Create BSP cards for analysis on Tuesday height’s effect on blood angle’s effect on blood Homework: “What’s in a Name” due on Tuesday! Work in groups of 2 Divide up the tasks or you will not finish!. Monday 9/17 .

urvi
Download Presentation

Today’s Assignments

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Today’s Assignments • Blood Typing • Create BSP cards for analysis on Tuesday • height’s effect on blood • angle’s effect on blood • Homework: “What’s in a Name” due on Tuesday! • Work in groups of 2 • Divide up the tasks or you will not finish!

  2. Monday 9/17 • Learning Target: How does blood spatter affect a crime? • Bellringer: What does blood spatter tell you about a crime?

  3. Wednesday 9/18 • Learning Target: How does blood spatter affect a crime? • Bellringer: What does area of convergence in a blood spatter tell you about a crime scene? • How do you determine sin on your calculator, how do you determine inverse sin on your calculator? What is sin?!

  4. Why did the police suspect the wife did not fall and injure herself • What would they need to find out about the bloodstain on the husbands sleeve to validate their suspicions • Was there other evidence the police could use to prove of disprove the husband’s story?

  5. WHAT BSP’S TELL INVESTIGATORS • ORIGIN OF THE BLOOD STAIN • TYPE OF INSTRUMENT THAT CAUSED THE STAIN • DIRECTION FROM WHICH OBJECT STRUCK VICTIM • RELATIVE POSITIONS OF • VICTIM • ASSAILANT/S • BYSTANDERS • LOCATION AND MOVEMENT OF PERSONS INVOLVED • NUMBER OF BLOWS OR GUNSHOTS • TRUTHFULNESS OF SUSPECT OR WITNESSES

  6. OOZING, GUSHING AND DRIPPING* EXSANGUINATION • 2 WAYS BLOOD LEAVES THE BODY • PASSIVE Drips • DEPENDS ON GRAVITY • PATTERN IS A RESULT OF GRAVITY ON DROPS OF BLOOD • INCLUDES OOZES AND DRIPS • SMALLER CUTS/STAB WOUNDS • BLOODY NOSES • WEAPONS DRIPPING • WOUNDS THAT WEEP THROUGH CLOTHES

  7. PASSIVE BSP’S • FORM BECAUSE OF GRAVITY NOT FORCE • GUSHING BLOOD VS. OOZING BLOOD • BLOOD DRIPS COME FROM ANY ELEVATED OBJECT • DROPS ARE SMALL AMOUNTS OF BLOOD DROPPING AWAY FROM A LARGER SOURCE • Drops don’t break into smaller drops by moving through the air • Why? Surface tension • BLOOD DROPS AS A SPHERE UNTIL IT HITS SOME OTHER SURFACE LIKE THE FLOOR! • Swinging arm, edge of a table, weapon

  8. THURSDAY • LT: I can describe the different variables that will affect the size of blood spatter • BR: T/F As height increases the diameter of a passive Blood drop increases? • What is the angle of impact for a drop of blood that is 10mm wide and 33mm long?

  9. Falling Drops • Strike surfaces and splash in all directions • Spatters in a circular pattern around the point of impact • Shape & size of BSP’s =: • Size of drops (amount) • Speed of falling drops • Surface the blood strikes • Angle at which blood hits the surface • Height from which blood falls

  10. 3. 1. 2. 1. PARENT DROP2. SPIKES 3. SATELLITES

  11. THE SURFACE BLOOD STRIKES Blood on glass or smooth surfaces would look like this: Blood on concrete would look like this!

  12. 90 ° angle of impact • Forms even circles around point of impact

  13. 10 °angle of impact • Forms elongated oval patterns with narrow point aiming in the blood’s direction of travel.

  14. Tuesday • Learning Target : I can determine the different heights of blood spatter • Bell ringer: what is cohesion, adhesion, and surface tension of blood?

  15. Terminal Velocity is: themaximum free fall speed of a drop • a drop of blood is • Shape • Size • Terminal velocity of blood is: 25 ft./second So WHAT? • Blood reaches that speed after falling from 7 ft.

  16. PROJECTED spatterPERSON OR OBJECT APPLIES SOME FORCE OTHER THAN GRAVITY ARTERIAL BLOOD SPURTS CAST OFF or IMPACT SPATTER FORCE COULD BE NATURAL • OR EXTERNAL

  17. THE SURFACE BLOOD STRIKES Blood on glass or smooth surfaces would look like this: Blood on concrete would look like this!

  18. ANGLE OF IMPACT 90 °IMPACT ANGLE 10° IMPACT ANGLE EVEN CIRCLES AROUND POINT OF IMPACT ELONGATED AND TAILS POINTING IN DIRECTION OF TRAVEL

  19. ANALYZING PROJECTED SPATTERS WITHIN A SPATTER WHAT CAUSES SPATTER BLOOD STAINS VARY IN SIZE AND SHAPE BUT ARISE FROM A SINGLE INJURY A SINGLE STAIN (pool) IS NOT A SPATTER, BUT A GROUP OF STAINS IS. STABBING BEATING GUNSHOTS ARTERIAL BLEEDING CAST-OFF BLOOD SPLASHING EXPIRATED BLOOD

  20. Additional Terms

  21. Determining point of origin • find the point of convergence • Determine the angle of impact • Find the length of the adjacent side of the triangle or the length from the top of the blood drop to the center of convergence • Convert the length from cm -> mm -> ft you can skip the middle step if you need to • Find the point of origin by taking the [tan angle](length of the adjacent side)

  22. The Names of God Jesus Light of the World Root and offspring of David Precious corner stone Lamb of God Faithful and True The righteous judge Wonderful, counselor Prince of Peace Eternal Father Alpha and Omega Emmanuel King of Kings and Lord of Lords Healer, helper, brother, friend Savior Advocate High Priest

  23. Analysis of Activity 8-3 Measure each blood drop in cm on Data Table Compare data with one other lab group cm

More Related