NEW tables: go to them, please! BACK R TABLE KAYLA BACK L TABLE DOMINQUE JACY ELENA VERONICA MADISON TABLE SYDNEY TRINITY FRANKIE ALEC BRIANNA CALISTO EMANUEL ALEXIS MAURICIO JOSE SABRINA DAMARIS ANNA FRONT R TABLE CELESTE FRONT L TABLE PHOEBE EVELYN ISIZ GABBY STEPHANIE

NEW tables: go to them, please! BACK R TABLE BACK L TABLE TABLE GIOVANNA SIERRA WILLIAM DOROTHY RYAN ALEX EDER VICENTE HALEY AVORY ALEXIS S CHRIS VICTORIA MARQUISE M MICHAEL FRONT R TABLE TIFFANY FRONT L TABLE JOSH JESSICA BREANNA NICK SEVON MARQUISE G

SHAKE HANDS AND SAY ‘HELLO’ TO YOUR NEW TABLE PARTNERS.

DO NOW: Police broke into a house and found the owner slumped dead in a chair with a bullet hole in his head. On the floor there is a gun and on the table a cassette recorder. When an officer pushed play on the cassette recorder they heard the message "I cannot go on any longer and have decided to commit suicide" followed by the sound of a gunshot. The police immediately started a murder investigation. Why?

They didn't have to rewind the tape so somebody else must have. An answer They didn't have to rewind the tape so somebody else must have.

30 seconds to take care of your business

Suggested text of the day Group MMS Mom Dad Bro Sis Friends Dog Cat Goldfish Parrot Ballistics is bananas

OBSERVE AND CLASSIFY GUNS AND AMMUNITION LEARNING OBJECTIVE OBSERVE AND CLASSIFY GUNS AND AMMUNITION

IDENTIFY INDIVIDUAL MARKINGS ON AMMUNITION. LEARNING OBJECTIVE IDENTIFY INDIVIDUAL MARKINGS ON AMMUNITION.

TODAY’S AGENDA DO NOW: be kind, rewind Gun Card Sort Notes Ammunition Observation Lab Formative blog post PLEASE REMINDER ME TO HAND BACK YOUR QUIZZES

Simple Definition of ballistics Full Definition of ballistics : the science that studies the movement of objects (such as bullets or rockets) that are shot or forced to move forward through the air      Full Definition of ballistics 1a :  the science of the motion of projectiles in flight b :  the flight characteristics of a projectile 2a :  the study of the processes within a firearm as it is fired b :  the firing characteristics of a firearm or cartridge

Gun card sort Sort your guns in the way that you think they should be sorted. Think of a name/ description for each group of guns. 12 people will share.

How did you categorize this gun?

How did you categorize this gun?

How did you categorize this gun?

How did you categorize this gun?

How did you categorize this gun?

How did you categorize this gun?

How did you categorize this gun?

How did you categorize this gun?

How did you categorize this gun?

How did you categorize this gun?

How did you categorize this gun?

The gun that shot President Lincoln How did you categorize this gun?

Long Guns and Handguns Long guns Handguns Automatic and Semi-automatic Rifles fire bullets Shotguns fire pellets (shot) or a single projectile (slug). Handguns Pistols fire bullets with one hand Revolvers have a cylinder that holds usually six cartridges Automatic and Semi-automatic

The bullet that killed President Lincoln

Chapter 17 Ballistics By the end of this chapter you will be able to: Explain the differences between a handgun, a rifle, and a shotgun Describe rifling on a gun barrel and how it affects the flight of the projectile Explain barrel size and caliber All Rights Reserved South-Western / Cengage Learning © 2012, 2009 Forensic Science: Fundamentals & Investigations, Chapter 17

Introduction Ballistic evidence helps explain: What type of firearm was used The caliber of the bullet The number of bullets fired Where the shooter was located Whether a weapon was fired recently If a firearm was used in previous crimes

History of Gunpowder and Firearms Chinese invented gunpowder over a thousand years ago Muzzle-loading matchlocks used wicks to ignite the gunpowder Cartridge and breech loading Revolver, semi-automatic, and automatic handguns

How a Firearm Works The firing pin hits the base of the cartridge, igniting the primer powder The primer powder sparks through the flash hole to the main propellant supply

How a Firearm Works The pressure of the explosion pushes the bullet from the casing into the barrel The bullet follows the lands and grooves spiraling out of the barrel

Long Guns and Handguns Long guns Handguns Automatic and Semi-automatic Rifles fire bullets Shotguns fire pellets (shot) or a single projectile (slug). Handguns Pistols fire bullets with one hand Revolvers have a cylinder that holds usually six cartridges Automatic and Semi-automatic

Firearms and Rifling Grooves and ridges (lands) in the barrel of a gun produce the twisting that adds accuracy This leaves a pattern on the bullet that is unique (individual evidence!)

Bullets, Cartridges, and Calibers Cartridge—a case that holds a bullet, primer powder, and gunpowder The bullet, usually of metal, is out front with the cartridge, holding the primer and propellant powders, behind.

Marks on the Spent Cartridge Casings Firing pin marks appear on the rim or center of the spent cartridge can be used to match a cartridge to a firearm Breechblock marks produced when the cartridge casing slams backward and strikes the breechblock Extractor marks Ejector marks

Caliber of the Cartridge Caliber—a measure of the diameter of the cartridge https://www.youtube.com/watch?v=vQenL87zAD8 In hundredths of an inch OR thousandths of an inch OR millimeters. Why should the caliber of ammunition match the firearm that shoots it? If they do not match, what could go wrong?

The Study of Bullets and Cartridge Casings How is each fired bullet marked? What is the procedure to match a spent bullet to the firearm that shot it? What makes up a test-firing, and why is it done? Forensic Science: Fundamentals & Investigations, Chapter 17

FORMATIVE BLOG POST Take a picture of your ammunition lined up next to your chart. Post the picture on your blog. Write 2-3 sentences explaining the most important ideas you learned today. ** You can include a link to your learning partners’ blog if you want.