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Long Range Hunting & Shooting
recoil v accuracy
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<blockquote data-quote="lightwind" data-source="post: 522040" data-attributes="member: 30140"><p><a href="http://www.longrangehunting.com/forums/members/rdm416/" target="_blank">http://www.longrangehunting.com/forums/members/rdm416/</a>: Wow. All your video shows is a slowmo of the bullet and the gun. It does not do a good job of showing the gun accelerate while the bullet is in it. Let me give you another perspective on the system. What has happened is that there is an "impulse" on both the bullet and the gun (with the hand). One of the laws that is involved is momentum. In this system momentum is conserved. Energy is conserved but changes forms from motion to a combination of motion and heat and is more difficult to keep track of. </p><p></p><p>Since momentum is conserved we can use those equations of motion to see that the center of mass of the system stays the same. In the beginning the total momentum of the system was zero and after the impulse (integral of force over time) the momentum is still zero with the bullet moving forward and the gun moving backwards. In the video the initial impulse is not clear since the gun and hand are accelerating much slower than the bullet (because they weigh more). </p><p></p><p>You are right about the gun going back being similar to a rocket going forward because the same rules apply. However, what you don't seem to understand is that the rocket starts being accelerated by the force of the propellant as it is accelerated starting at zero motion. It is not accelerated just by the gas leaving the rocket, it is accelerated the whole time the gas is accelerated. </p><p></p><p>You use the example of the muzzle brake. What happens is that at the end of the barrel the direction of the gas is changed which applies a force to the gas and to the gun simultaneously mitigating the recoil that the mass of gas escaping through the muzzle would have taken with it.</p><p></p><p>Please let me know what is not clear in this explanation because I would like to clear this up.</p></blockquote><p></p>
[QUOTE="lightwind, post: 522040, member: 30140"] [URL="http://www.longrangehunting.com/forums/members/rdm416/"][/URL]: Wow. All your video shows is a slowmo of the bullet and the gun. It does not do a good job of showing the gun accelerate while the bullet is in it. Let me give you another perspective on the system. What has happened is that there is an "impulse" on both the bullet and the gun (with the hand). One of the laws that is involved is momentum. In this system momentum is conserved. Energy is conserved but changes forms from motion to a combination of motion and heat and is more difficult to keep track of. Since momentum is conserved we can use those equations of motion to see that the center of mass of the system stays the same. In the beginning the total momentum of the system was zero and after the impulse (integral of force over time) the momentum is still zero with the bullet moving forward and the gun moving backwards. In the video the initial impulse is not clear since the gun and hand are accelerating much slower than the bullet (because they weigh more). You are right about the gun going back being similar to a rocket going forward because the same rules apply. However, what you don't seem to understand is that the rocket starts being accelerated by the force of the propellant as it is accelerated starting at zero motion. It is not accelerated just by the gas leaving the rocket, it is accelerated the whole time the gas is accelerated. You use the example of the muzzle brake. What happens is that at the end of the barrel the direction of the gas is changed which applies a force to the gas and to the gun simultaneously mitigating the recoil that the mass of gas escaping through the muzzle would have taken with it. Please let me know what is not clear in this explanation because I would like to clear this up. [/QUOTE]
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