Chapter 17: Ballistics

Bullets come in different shapes
The density of combustion particles increases with the distance from the bullet hole
The cartidge found at a scene may provide both class and indivudual evidence
a firearm is a weapon, such a gun, capable of firing a projectile using a confined explosive
Bullet size is expressed in meters
the path of flight of a projectile is its trajectory
Lands nad grooves are individual characteristics
ballistics is the study of rifles
cannelures on a bullet result from the bullet being fired from a gun
the datebase for bullets is contained within CODIS
IBIS is maintained by the ATF
Modern firearms are divided into two basic types – rifles and shotguns
over a thousand years ago, the Chinese invented gunpowder, which is a mixture of charcoal and sulfer
Rifles fire bullets, while shotguns can fire
either small, round pellets or a single projectile called a slug
To get a known bullet for comparison, investigators test-fire the weapon into
a water tank or gel block
a revolver would be considered a
Matchlock weapons were replaced by flintlock weapons which used
sparks or a chip of flint to ignite the gunpowder
gunshot residues containing nitrates can stick to the person holding the firearm and leave a mark on the:
hand, arm, face, clothing, or hair of the shooter and depending on the distance of the shot, the victim as well
Breechblock marks are produced as the cartridge casing moves:
backward and strikes the breechblock
Firing pin marks left on a spent cartridge casings can also be used to identify a firearm. firing pin marks are impressions made:
on the bottom of the cartridge by the firing pin, as it strikes the bottom of the cartridge when the firearm is shot
The word rifle, originally referred to the:
grooves, or indentations, in the rifle’s barrel
Which of the following leave marks on the cartridge?
All of them do?
A significant part of ballistics involves examining used:
bullets and their spent cartridge casings for telltale markings left on them by the firearm that shot them
The long, metal tube that guides a projectile out of a firearm is the
The end of the barrel, where the projectile exists a firearm is the
The earliest firearms were
matchlock weapons and had wicks to carry a flame to the gunpowder
The term bullet is often incorrectly applied to the
cartridge, which includes primer powder, gunpowder, the bullet, and the casing material that holds them all together
Bullets and their cartridges are named by
caliber and length
A single shot or bullet in a shotgun shell is called a
Firearms databases can be searched to match crime scene evidence to
registered weapons
___ residues are traces of smoke and particles of unburned powder carried sideways from the firearm by the expansion of gases as the bullet is fired
Modern ammunition consists of 4 components which are:
cartridge case, primer, propellant, and projectile
Within a gun’s barrel, lands and grooves cause a bullet to spiral. This ____ pattern, left on the bullet is specific to the firearm used to shoot the bullet
____ are parallel sets of scratches on a bullet caused by unique markings in the bore of a rifled weapon
Cartridge striae
the ___ is the portion of the gun that contains the firing mechanism
a masure of the inside diameter of a firearm barrel or the diameter of the cartridge shot in the firearm is referred to as the
semi-automatic weapons, which fire only one shot per pull of the trigger differ from ____ weapons, which fire repeatedly
Samuel Colt developed the _____ in 1835
the _____ is a container that holds cartridges under spring pressure to be fed into the gun’s chamber