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How is ICT used in conservation?

Police how is conservation of momentum used in performing ballistic tests?

  • Policemen doing animal investigation perform ballistic tests. This test determines from which gun the bullet was fired. how conservation of momentum is used in this test?

  • Answer:

    I guess it depends on what you want to know. Ballistics is a very special form of physics. With Ballistics to tell which Gun fired which bullet, they don't use conservation of Momentum; rather, each gun has unique rifling on the inside of the barrel, and bullets fired from a smooth barreled gun have different markings and powder burn marks. It is from this that police are able to tell which bullet was fired from which gun. The only other thing I could think of is caliber and power identification, how the bullet acts and how kinetic energy is distrubted would probably be the closest to what you are looking for. In any case the reaction would be totally inelastic (unless your superman and bullets bounce off of you)

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Projectile energy is calculated with a "ballistic pendulum". This is usually a block of clay suspended by two wires. A bullet is fired straight at it and the maximum height the block swings to is recorded. From the mass of the combined clay and bullet and the height they reach, the kinetic energy can be calculated. From the energy and the bullet's mass, the bullet's velocity can be determined. E = (m+M) gh = 1/2 m v^2 or something like that. Knowing the velocity might help the police determine the gun type, for instance, a regular .357 vs. a .357 magnum.

craig p

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