Johnbowne.enschool.org
BALLISTICS
for comparison microscope
Username: fmelas@schools.
Password: ysggu4z
OBJECTIVES: By the end of these lessons, the students will be able to:
1. Define words related to the topic
2. Discuss the difference between a handgun, a rifle, and a shotgun
3. Distinguish between a bullet and a cartridge
4. Discuss rifling on a gun barrel and how it affects the flight of the projectile
5. Explain the relationship between barrel size and caliper
6. Explain how bullets are test-fired and matched
7. Discuss the role of ballistics recovery and examination at the crime scene
8. Determine the position of the shooter based on bullet trajectory
Aim: What is forensic ballistics? Learning the ballistics language
DAY 1
Do Now: Define the following:
1. Bullet primer
2. Firearm
Go over ppt slides 1-6, allowing students time to take notes and ask/answer questions.
Exit Slip: Go to
Take quiz: Self Assessment
DAY 2
Aim: What is forensic ballistics? Learning the ballistics language
Do Now: Define the following words:
1. GSR
2. Lands and grooves
Go over ppt slides 7-8, allowing students time to take notes and ask/answer questions.
EXIT SLIP: List the different parts of a cartridge.
DAY 3
Aim: What is forensic ballistics? Learning the ballistics language
Do Now: Define the following words:
Rifling = the spiral pattern of lands and grooves in the barrel of a firearm.
Muzzle = the end of the barrel from which the projectile exits a firearm.
How about this new word? Can you define it?
Trajectory = the path of flight of a projectile.
Go over ppt slides 8-12, allowing students time to take notes and ask/answer questions.
Assessment: Slide 12 activity on crime scene evidence analysis.
Work will be collected as exit slip.
DAY 4
AIM: How did ballistics become a forensic science discipline?
Do Now: Explain the difference between a pistol and a revolver.
Answers should include:
A revolver is a type of pistol. It is a multishot firearm, usually a handgun, in which the rounds are held in a revolving cylinder that rotates to fire them through a single barrel.
Pistols are smaller, lighter, easier to conceal, faster to bring to bear, and sometimes may have more safety features than other firearms.
A pistol is a handgun with a chamber that is integral with the barrel, as opposed to a revolver, wherein the chamber is separate from the barrel as a revolving cylinder.
Show last slide of ppt.
CLASS ACTIVITY: Reading in pairs. Based on English regents exam, there are only a couple of weak readers in the class, and they will be paired with a strong reader.
Read: “The Birth of Ballistics: The St Valentine’s Day Massacre” and answer all five questions.
Work will be collected at the end of the period.
DAY 6
AIM: How are bullets from different crime scenes matched to one another and to a weapon?
Do Now: What is a comparison microscope and how does it work?
Go over ppt slides 13-21, allowing students time to take notes and ask/answer questions.
DO NOW: Use the information and crime scene sketch on slide 21 to write two lines of evidence based on ballistics: One for the prosecution and one for the defense.
BALLISTICS: FIREARM ID
DAYS 7& 8
AIM: How do I learn to match unknown bullets and cartridges to exemplars?
DO NOW: Go to “” and log in using:
The log-in key that the students will use is: C38314
For the students to log-in they have to use the classroom link under the Resource Area Menu on the home page.
Activity:
• Use the virtual comparison microscope to complete the Bullet ID-VCM.
• Use the virtual comparison microscope to complete the Cartridge Case ID-VCM.
Play with the tutorial first to familiarize yourselves with the activity.
Do all 4 (or 8) tests at the bottom of the tutorial.
Assessment:
• Individual student scores and participation levels will be checked in the virtual classroom I set up with firearmsid in the private instructor’s area.
• Students are able to complete their work and/or log in more ballistics practice at home.
• Students may complete their assignment at home as homework.
DAY 7
AIM: So you want to be a ballistics expert? What will you be doing?
DO NOW: What are rifling impressions and how are they made?
Go over ppt slides 22-26, allowing students time to take notes and ask/answer questions.
EXIT SLIP:
1. Which category of ballistics deals with riffling?
2. How is trajectory important in crime scene reconstruction?
DAY 8: Wound Ballistics
AIM: What are some factors that affect the type of wound afflicted?
DO NOW: Define terminal ballistics.
Go over ppt slides 27-33, allowing students time to take notes and ask/answer questions.
EXIT SLIP: How are the triangular tears on the skin formed, in contact wounds?
Go over vocabulary associated with the topic (20 minutes).
Part 1 of Washington sniper attack: Crime Chronology. Have students read crime chronology. Examine location map. Make a numerical list of crimes from location map.
VOCABULARY
Ballistics = the study of projectiles (bullets) and firearms.
Barrel = the long, metal tube that guides the projectile out of the firearm
Breech = the end of the barrel attached to the firing mechanism of the firearm where the cartridge is loaded.
Bullet = the projectile that is released when the firearm is discharged.
Bullet primer = a device for igniting the powder charge.
Caliber = a measure of the inside diameter of a firearm barrel.
Cartridge = a case that holds a bullet, primer powder and gun powder.
Firearm = A weapon capable of firing a projectile using a confined explosive as a propellant.
Fully Automatic = a firearm with a clip-fed mechanism that fires repeatedly as long as the trigger is pressed.
Gunshot residue (GSR) = the tiny particles expelled from a firearm when it is fired.
Lands and grooves = the ridges (lands) and depressions (grooves) found on the inside of the firearm’s barrel that are created when the firearm is manufactured.
Muzzle = the end of the barrel from which the projectile exits a firearm.
Pistol = a handheld firearm.
Revolver = a pistol with a revolving cylinder.
Rifle = a firearm that has a long barrel.
Rifling = the spiral pattern of lands and grooves in the barrel of a firearm.
Semiautomatic = a pistol with a clip-fed mechanism that fires one shot per pull of the trigger: The empty cartridge ejects and the next cartridge advances automatically.
Trajectory = the path of flight of a projectile.
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