![]() ![]() as a particle moves along a curve under the action of a force, only the component of the force directed along the curve does work on it, either increasing or decreasing its speed. Whether all of that work is used to destroy the target is a function of the details of the projectile and the target, the impact, etc., but the fundamental property that it all starts with is the kinetic energy of the projectile.ĬAUTION, MATH AND PHYSICS AHEAD. The reason we use kinetic energy is because it is a measure of how much work is available to deliver to a target. or the work that a particle with mass m moving at speed v can do on something else. The kinetic energy (the one we are talking about here) is the work required to get a particle with mass m at rest to move at some speed v. Google on the term "point blank distance" for further discussion. High speed permits accurate placement to a farther distance. The draw back with slow projectile speed is loss of the ability to place the projectile to deadly effect at distance due to drop. The 30-30 has a similar kinetic muzzle energy as the 220 swift but it should be obvious which you would trust to bang a moose in the shoulder with at 40 steps.Īnother meaningful indicator of penetrating cabability is momentum which is simply the object's mass time it's speed.Ī heavy slow projectile can kill all out of proportion to what it's kinetic energy residual might indicate. Kinetic energy of a projectile is a common reference for killing power but has limitations in meaningfulness due to bullet size and construction. That is why a blunt shotgun rifled slug has enormous kinetic energy at the muzzle yet has lost more than half of it by 75 yards, while a 30-06 with a pointed bullet started with a similar muzzle energy retains 90 percent of what it had to start at the same distance. Projectiles that shed speed rapidly also shed their kinetic energy at the square of the deceleration. ![]() As you can see by the formula, kinetic energy values are heavily weighted by the speed of the object. The units come out to something called foot-pounds in English measure.Īt any point (distance) along it's travel a projectile can be examined for kenetic energy if you know its speed. For any moving object it's kinetic energy can be determined by taking one half of it's mass times the square of it's speed. ![]()
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