subrosaDom -> RE: The ignorance of liberals (7/13/2014 1:01:27 AM)
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@Letstalk -- it's dangerous to use science, physics and logic in these forums. You'll find out soon enough. Great post, though. quote:
ORIGINAL: LetstalkboutRAP3 @DomKen Momentum and energy are both always conserved. Where they go is the question. Momentum ultimately ends up in either the Earth or the air after moving through the weapon and/or the shooter. Energy has all kinds of things it can do. It can turn into motion, light, heat, mechanical energy, deformation energy (bones, tendons, tissue)... When a given round is fired, and given rounds always contain (almost) exactly the same amount of chemical energy (powder charge), if it is fired from a semi-automatic some of it's energy is used to perform the work of ejecting the spent casing and loading the next cartridge. That is energy that is then unavailable to do anything else, like, say, hit the shooter in the shoulder. Semi-automatics have additional parts, which means more mass, which means the weapon accelerates backward more slowly. Slower acceleration over a given distance (stock to shoulder) means lower velocity. Kinetic energy increases linearly with mass, and exponentially with velocity. This is why semi-automatics produce less felt recoil than their manual feed counterparts, because there actually is less energy moving into the shooter. This is well established within the shooting community and supported by classical mechanics. It can be substantially less too, depending on the weapon and round in question. Now, the action of a semi-automatic introduces additional moving parts to the weapon, and additional entropy (waste heat, again energy that isn't available to hurt the shooter, although this time it really is a negligible amount of energy). This can cause some of the momentum of the blast to be directed up/down/left/right through the weapon instead of backward into the shooter, which can make the weapon harder to handle and can be hard on joints. That isn't why snipers prefer manual feed weapons though. Snipers fire one shot for one kill, so weapon sway isn't really an issue for them, because they will have plenty of time to recover and aim before a second shot. The reason that snipers prefer manual feed weapons is because they are generally the simplest, most reliable, and most accurate weapons available.
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