John Bowne High School



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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