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34 Cards in this Set
- Front
- Back
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ballistics
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The scientific analysis of firearms, bullets, and the travel of projectiles in flight
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firearm
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A weapon, such as a gun, capable of firing a projectile using a confined explosive
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Chinese
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Who first invented gunpowder over a thousand years ago to make fireworks and weapons?
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matchlock
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This type of weapon is considered the first firearm; they use wicks to ignite the gunpowder
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flintlock
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An old type of weapon that used sparks from flint to ignite the gunpowder
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muzzle-loader
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Term for early weapons in which the shooter had to manually pack the gunpowder and bullet down into the barrel
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breech-loading
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Muzzle-loaders were replaced by these firearms with the advent of the cartridge
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cartridge
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Also called a round; a case that holds a bullet, a small amount of exploding primer powder, and the gunpowder
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primer
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A volatile compound that ignites when struck by the firing pin of a gun; it detonates the propellant in the cartridge
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gunpowder
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Term for the propellant in a weapon; it forms gases which push the bullet out of the cartridge and the gun barrel
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casing
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Term for the part of the cartridge that is left behind and does not propel with the bullet
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long guns
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Category of modern firearms which includes rifles and shotguns; require two hands for accurate shooting
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handguns
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Category of modern firearms can be fired with one hand; also called pistols
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revolver
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A pistol that holds several cartridges that can be fired one after another
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bullet
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The for the projectile propelled from a firearm
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caliber, length
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Two descriptors for which bullets are usually named
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caliber
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Term which refers to the diameter of the bullet; usually expressed in hundredths of an inch or in millimeters; also matches the diameter of the inside of a firearm's barrel
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rifling
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Term which refers to the grooves cut in a spiral down the barrel of a firearm to help increase range and accuracy; this also allows bullets to be matched to the exact gun from which they were fired
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breechblock
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A metal block that closes the aperture at the back part of a rifle or gun barrel and prevents a cartridge from shooting backwards towards a user as it recoils
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National Integrated Ballistics Information Network
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What does NIBIN stand for?
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NIBIS
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Abbreviation for the Bullet Identification System that hold records of ballistic markings of firearms used in previous crimes
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Drugfire
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Name of the FBI Database that holds data on cartridge casings
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GSR
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Abbreviation used for trace evidence made of smoke and unused powder particles that can land on the hand, arm, face, hair, and clothing of the shooter and victim
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gun shot residue
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What does GSR stand for?
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the distance from victim to shooter
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GSR patterns can be examined to help determine what?
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3
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How many hours after a gun is fired do you have to collect reliable GSR evidence?
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trajectory
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Term used to describe the path of a propelled bullet
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2
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How many reference points are needed to calculate the trajectory of a bullet?
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Pythagorean
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What math theorem can be used for triangulation with reference points?
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gravity
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Why may a bullet's path be slightly curved, especially when shot from long distances?
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entrance
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Which tends to be smaller- an entrance or exit wound?
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loaded
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What type of gun should never be submitted to the laboratory for evidence?
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serial number, make, model, caliber
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What four pieces of information about a gun should be recorded as it is documented for evidence?
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may contain latent fingerprints
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Why should a detective avoid excess handling of a gun before it is submitted for evidence?
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