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Bullet Trajectory

Welcome to Ballistics!. You’ll enjoy this one!. Bullet Trajectory . Notes on page 68-69. Sharpshooter. Firing Pin. Rifled barrel. Hammer. Trigger. Magazine. Parts of the Gun. Click to add text. Anatomy of a Bullet. Flash Hole. How is a Bullet Fired?. Pull the trigger

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Bullet Trajectory

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  1. Welcome to Ballistics! You’ll enjoy this one! Bullet Trajectory Notes on page 68-69 Sharpshooter

  2. Firing Pin Rifled barrel Hammer Trigger Magazine Parts of the Gun • Click to add text

  3. Anatomy of a Bullet Flash Hole

  4. How is a Bullet Fired? • Pull the trigger • Hammer is pulled back • Hammer is pushed forward • Hits the firing pin • Hits the primer • Causes primer powder to spark • Spark goes through flash hole and ignites rest of gunpowder How a Revolver Works

  5. What happens to evidence? • Bullets • Shot forward with a given force • Stop when sufficient force is acted upon it (hits something that slows it down, gravity pulls it down) Land Groove – the little lines etched in the grooves are the striations

  6. What happens to evidence? • Cartridge cases • Ejected from semiautomatic guns (usually to the right) • Remain in cylinder in revolvers Semiauto vs Revolver

  7. Individual or Class? • There are class characteristics, but when you look at striations, bullets are individual evidence • Cartridge casings are individual because of the extractor and ejector marks

  8. Bullets - Individual! • Play video!

  9. Cartridge Cases - Individual

  10. Important Forces • Forward force of the bullet • Downward force of gravity • To some extent: • Wind speed

  11. Bullet Trajectory • Trajectory: path of the propelled bullet

  12. Determining Location of Shooter • Need 2 reference points to make a straight line • Bullet holes in an object such as a wall, window or furniture • Bullet holes in a victim (entrance and exit count as two!) • Straight line tells investigators that shooter was somewhere on that line

  13. Trajectory

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