So any physics folks here? This is his reply as to the application of Newton's Law.
"Enough with the Newton’s Law crap! When used as an argument it sounds good, and apparently is very popular, but it does NOT work as you suggest. As I said before, that is simply throwing out a fine sounding physics term, but not doing the calculation! Except when the weight of the firearm is equal to the weight of the projectile, the weapon design includes no springs, slides, ejection mechanism or any other force mitigating features, then it does apply as you suggest.
Because Newton’s law say M1V1 + m2v2 = 0 where the first factors are the weapon and the second factors are the projectile, a simplistic look says that it is the same backward force, i.e., M1V1 = - m2v2 . Incorrect. It is the same total force applied across the system, not simply the same force in the opposite direction. First, mass is a constant, while velocity is its own computation, (which includes vector[directionality] as a factor). So, the mass of the weapon is a counterweight to the mass of the projectile. Even the simplistic calculation would go like this: (2.5 lbs)x = (0.0264286)(1180) [I used your BB number here], therefore, the rearward velocity would be 12.4 fps (surprisingly, not 1180 fps as the forward velocity is). However, because of the design characteristics additional energy is absorbed and transferred (the spring changes the vector, for example), the rearward force is further reduced. A very bad zip gun might approach an off the cuff application of Newton’s law, and apparently many, many people use that argument. Newton would shoot you.
Without going into every calculation [I’ve showed enough work here—BTW, I did not just look this up somewhere, I calculated it then used online tools to check my work], for a .45 that weighs 2.5 pounds (an empty standard 1911 is 2.4 so I rounded), the backward force (recoil) is 8 ft-lbs. (Which is less that dropping a 1 lb weight from 3.5 m)
Science is only science if it is applied. “Science” doesn’t tell us anything. Newton does not support the argument, when actually applied."
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