Posers and Puzzles
07 Mar 08
07 Mar 08
1 edit
How big of a bullet does it take to knock a man over? Assume he's wearing full body armor; the full energy of the bullet is absorbed. Let's suppose it hits him in the chest.
I'm not talking about a man falling over because he's wounded. I mean he falls over due to the force of the bullet hitting him and bowling him over.
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07 Mar 08
1 edit
Originally posted by AThousandYounghow tall is the man, what's he stood on, in what pose, and does the bullet damage him?
How big of a bullet does it take to knock a man over? Assume he's wearing full body armor; the full energy of the bullet is absorbed. Let's suppose it hits him in the chest.
I'm not talking about a man falling over because he's wounded. I mean he falls over due to the force of the bullet hitting him and bowling him over.
edit: exclude the damage question - you've already said he's not wounded!
07 Mar 08
2 edits
Originally posted by pineapple42Six feet, standing straight, feet together, hands at sides, shoulders squared, he's on a solid planar surface (concrete, say). He is hit in the sternum.
how tall is the man, what's he stood on, in what pose, and does the bullet damage him?
edit: exclude the damage question - you've already said he's not wounded!
I already know a normal rifle round won't do it.
http://ca.youtube.com/watch?v=aaS_2l8nGdg
08 Mar 08
Originally posted by AThousandYoungHow big the bullet is has nothing to do with it. What you mean is this: How much kinetic energy does it take in a bullet against someone wearing a bulletproof shield for that person to be knocked over' So a 22 going 1000 meters per second would have roughly the same kinetic energy of a 45 going 400 meters per second, having the same kinetic energy, they would impart the same thrust to the person, so its a matter of how much kinetic energy it takes to bowl a person over. What that energy would be depends on the person. A 6 foot wimp coming in at 100 pounds would certainly be easier to knock over than refrigerator Jones for instance.
How big of a bullet does it take to knock a man over? Assume he's wearing full body armor; the full energy of the bullet is absorbed. Let's suppose it hits him in the chest.
I'm not talking about a man falling over because he's wounded. I mean he falls over due to the force of the bullet hitting him and bowling him over.
08 Mar 08
Yes momentum is conserved, kinetic energy is not.
Another way to look at it is what force (F) is imparted to the man? Thats from
Ft = mv *
where mv is the momentum (before impact) of the bullet and t is the time the bullet takes to decelerate to a stop. This time element t will obviously depend on the construction of the bullet proof jacket.
* Assuming the bullet's momentum is negligible as the man falls!!
08 Mar 08
4 edits
Originally posted by sonhouseStandard rifle cartridge ratio between powder and bullet. 200 lbs. Average proportions.
How big the bullet is has nothing to do with it. What you mean is this: How much kinetic energy does it take in a bullet against someone wearing a bulletproof shield for that person to be knocked over' So a 22 going 1000 meters per second would have roughly the same kinetic energy of a 45 going 400 meters per second, having the same kinetic energy, they wou ...[text shortened]... in at 100 pounds would certainly be easier to knock over than refrigerator Jones for instance.
Would a 0.50 BMG do it? How about a Napoleonic cannonball shot (assuming the above powder to slug ratio)?
We also need to determine how hard the guy needs to be hit to be knocked over. That's not an easy bit of information to find.
09 Mar 08
Originally posted by AThousandYoungI've read that there is not a bullet made that has enough power to knock a man off his feet, even without a bullet proof vest on. Which nerves or nerve system a bullet strikes determines which way a person will fall. Some people get an in and out wound but they keep coming at you....until they bleed out.Rockets and artilery rounds are not considered bullets. That's all i know.
How big of a bullet does it take to knock a man over? Assume he's wearing full body armor; the full energy of the bullet is absorbed. Let's suppose it hits him in the chest.
I'm not talking about a man falling over because he's wounded. I mean he falls over due to the force of the bullet hitting him and bowling him over.
G.
09 Mar 08
Originally posted by smw6869The bullet proof vest would actually HELP the bullet knock the man off his feet. Without it a powerful round would go straight through and keep some momentum in the process.
I've read that there is not a bullet made that has enough power to knock a man off his feet, even without a bullet proof vest on. Which nerves or nerve system a bullet strikes determines which way a person will fall. Some people get an in and out wound but they keep coming at you....until they bleed out.Rockets and artilery rounds are not considered bullets. That's all i know.
G.
09 Mar 08
Originally posted by AThousandYoungI saw a video once where a guy held a large telephone book on his stomach. Another guy shot a 50 cal. round at it and the round had no affect on knocking the other guy over. DON"T TRY THIS AT HOME. like i did.
The bullet proof vest would actually HELP the bullet knock the man off his feet. Without it a powerful round would go straight through and keep some momentum in the process.
G
09 Mar 08
Originally posted by smw6869Telephone book?
I saw a video once where a guy held a large telephone book on his stomach. Another guy shot a 50 cal. round at it and the round had no affect on knocking the other guy over. DON"T TRY THIS AT HOME. like i did.
G
Those things go through engine blocks...