- Oct 7, 2000
- 11,554
- 12
- 81
why does gun go up when it has been fired?
- Thread starter MustangSVT
- Start date
The guns barrel is mounted above your grip (for aiming purposes). Thanks to Mr. Newton, we know about the whole "equal and opposite" thing. The bullet can be represented as a force exiting the barrel. However, you also have a force acting like it is pushing the barrel towards the shooter, with the same force as the bullet had when it exited the muzzle. As stated before, the barrel is evelated above the grip (usually). So there is a force pushing backwards from above your grip, thus you have muzzle climb.
DannyBoy
Diamond Member
GagHalfrunt
Lifer
- Apr 19, 2001
- 25,284
- 1,997
- 126
They should. Even if they skip physics, all high school students should have a strong knowledge of firearms. Damn, what kind of HS gang are you going to get into if you don't understand muzzle climb? Too geeky for the Bloods or Crips, too dumb for the chess club, all that's left is the marching band.
Whitecloak
Diamond Member
- May 4, 2001
- 6,074
- 2
- 0
AHAHAHHA..I need to right that down
SERIOUS:| ANSWER:
Force equalt othat of the gun leaving is applied to the gun itself. since you're holding it bellow where the force is excerted(recoil) your hands actas a fulcrum
THe visiting professor Albert..uhem..MR> Einstein says:
:beer:
SunnyD
Belgian Waffler
BINGO! WE HAVE A WINNAR!
Honestly - hold your arm straight out as if you were holding a gun. When the gun is fired (as was said previously) an equal force is applied exactly opposite the direction the bullet is moving (out of the barrel). the the barrel is parallel to the length of your arm, a back-force is running directly parallel to your arm as well.
If you're currently holding your arm out as if you were holding the gun, take note of the position of your elbow joint. For most all people, your elbow should be for the most part facing down toward the ground and possibly somewhat turned outwards away from your body. Not only does your wrist take the shock of the backforce, but there will most definitely be enough kinetic energy to apply the backforce all the way into your shoulder. Your body for all intents should not allow the bulk of this energy through that far, and it's first (well second) weak spot is the elbow in this matter. Your elbow will act in this case as a recoil spring, and in conjunction with your shoulder, the arm should buckle backwards at the elbow. Now look at where your elbow is again. The should receives the benefit of stabilizing force from the rest of your body, while the forearm receives the effect of the backforce - leaving your elbow only one place to go.
The two opposite forces cause the elbow to buckle at the joint in the only direction it is designed to go. Your body reacts to the backforce pushing your shoulder and upper arm forwards (you lean into the backforce), while the backforce pushes your forearm backwards (at the wrist because that is the first pivot point). The elbow drops down and slightly outwards so it can absorb the backforce as recoil. The wrist only has a limited range of motion side to side (up and down in the case you are holding a gun), so as the elbow drops and the wrist can no longer compensate for the angle of the arm, it pulls the hand somewhat upwards.
It's honestly easy to demonstrate. Just hold your arm out like you were holding a gun, then jerk it back at the wrist while trying to keep your elbow straight and your shoulder forward (this will simulate your body reacting to recoil). You should notice the way your elbow drops and your wrist and hand move slightly upwards.
There ya go.
TMI!
Uhm....wow, lol.
So first of all...equal and opposite forces: the gun will push back on your hand with the same force that it used to fire the bullet. So if the barrel was lined up perfectly w/the center of your arm and caused no torque...and your elbow didn't buckle under the force then that gun (almost) wouldn't go up.
^^is not the case. The barrel is above your hand (for aiming). So suppose we fired the gun in outer space. It would start rotating clockwise after you fired, since the counter-force is at the rear. It's like a seesaw. Thus when it fires, it applies torque to your wrist (counterclockwise). If you like, hold your arm out straight and jerk your wrist back, you'll notice that the arm kind of "buckles."
There you go...essentially the answer to you question, I think.
So first of all...equal and opposite forces: the gun will push back on your hand with the same force that it used to fire the bullet. So if the barrel was lined up perfectly w/the center of your arm and caused no torque...and your elbow didn't buckle under the force then that gun (almost) wouldn't go up.
^^is not the case. The barrel is above your hand (for aiming). So suppose we fired the gun in outer space. It would start rotating clockwise after you fired, since the counter-force is at the rear. It's like a seesaw. Thus when it fires, it applies torque to your wrist (counterclockwise). If you like, hold your arm out straight and jerk your wrist back, you'll notice that the arm kind of "buckles."
There you go...essentially the answer to you question, I think.
I think teachers aren't allowed to teach about guns... =/
It's not that intuitive of an answer, really. And it turns out my hand-is-a-fulcrum conclusion that I cam to myself after I pondered this for awhile was shot down (Excuse the pun) by SunnyD's post. =/
It's not that intuitive of an answer, really. And it turns out my hand-is-a-fulcrum conclusion that I cam to myself after I pondered this for awhile was shot down (Excuse the pun) by SunnyD's post. =/
Pardon the extremely crude drawings and explanation...
Imagine holding a gun out in front of you like you're going to fire.
gun
Now imagine super-imposing the following picture over the previous one:
forces at work
Imagine holding a gun out in front of you like you're going to fire.
gun
Now imagine super-imposing the following picture over the previous one:
forces at work
Squisher
Lifer
- Aug 17, 2000
- 21,204
- 66
- 91
Originally posted by: Jfrag
Originally posted by: whitecloak
:beer:
Yes, after exiting the barrel the bullet then exerts a substantial draft that it causes the pressure in the barrel to drop to such an extent that the the barrel becomes hyper-vacuumnous and the gun is in such a state of lighter-than-airness that the lack of barometric pressure will potentially pull the gun into a low level orbit unless held securely.
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