MythBusters - Knock Your Socks Off - Bullet Doozy

[sethmusic]

is there a way that i can BLOCK discoverynetworks from ever showing up in my recommended videos? they're always ALWAYS a let down. :(

[juhotheonehanded]

dear discovery.could you even show us full old episodes like from season 1

[MeetTheseIronFists]

if a bullet is dropped, IN A VACCUUM and another bullet from the same height is fired, IN A VACCUUM, they will hit the ground at the same time due to the acceleration of gravity.

[albinoman13bt]

Of course they'd hit at about the moment. Forces at right angles to each other are independent assuming no deflection or lift being created. Technically the bullet should hit very slightly later due to Earth's curvature.

[longfootbuddy]

hes going for the andy warhol look in this one

[SouthSideProRider]

Damnnnnnnn, Adam's hairline at the beginning

[TheDesertKings]

SPOILERS

To those who haven't seen it who want to know, it was myth confrimed. The difference in the time between the bullets hitting the ground was 0.39 milliseconds. The dropped bullet hit the ground first. Though I would have loeved to see them hit exactly, but Im guessing there are variables we cant stop. Is it trulty myth confirmed based upon the high speed, or is 0.39ms really the same time? Anyone?

[blacjack11]

i am having an argument with my friend and it goes like this: will a bullet fired up come down at the same speed when it left the barrel. He thinks it comes down at the same speed when it left the barrel, and my physics teacher agrees with him, i dont i think it comes down at a slower speed because it only has gravity acting upon it where as the bullet fired up has the force of the explosion in the barrel to propel it. Can someone please tell me who is right.

[mindthreat44]

Yeah it only has gravity acting upon it when it comes down so most likely they're going to be going at different speeds unless the speed it goes up just so happens to be the same speed that it came down. In my mind the likelihood of them just oh so happening to be the same speed is very unlikely. Pick out a gun, find out it's muzzle velocity, and figure out how the fast the bullet is falling based on its weight and gravity. If your physics class is anything like mine shouldn't be too hard for ya

[hydroxiderecords]

It will come down slower. I cant tell you the physics behind it but it has something to do with the air resistance. I read a paper on the same argument.

[s1mmelOne]

Gravity will work in both ways. Pull the trigger and the speed will be decreased while the motion is upwards. When the point has come that the bullet has reached the highest point (with gravity tugging on it til then) it will fall back to the ground, this time gravity will increase the speed of course, but at the same time the air drag will work on it too and will slow it down, even if a bullet is small.

I'd say the speed is different!

[ABCKorpi]

If you are shooting in a vacuum meaning without air resistance the speed exitting the muzzle and the falling speed at the hight of the muzzle will be exactly the same. However if you just grab a gun and try, the bullet will come down much slower than fired because of the air resistance. The main thing behind that argument is conversion of different forms of energy. Kinetic energy is transformed into potential energy and back. Only the air resistance drains energy from the bullet.

[Crypt1cmyst1c]

you are right, assuming the terminal velocity of the bullet is lower than the firing speed. if the bullet fired can go (for our purposes) 500fps, and its terminal velocity is 600fps, it is possible (i believe) for it to surpass the speed in the fall (possibly not if it doesnt accelerate fast enough when falling, it might not reach terminal velocity when falling, im not sure) but your reasoning is correct. i believe terminal velocity of a bullet is slower than firing speed, so it wouldnt be going

[ABCKorpi]

even if the muzzle velocity is lower than the terminal speed (which is very unlikely for modern firearms) the speeds will not be exactly the same, because the air resistance drains the energy of the bullet leaving the barrel so at the highest point of the trajectory the potential energy will be somewhat less than the kinetic energy at the start. and also on the downward slope again the bullet looses energy. So from the speed difference you can calculate the energy lost due to air resistance.

[ABCKorpi]

I Looked it up and calculated it through: if you fire a 9mm into the air it reaches about 1100 meters of altitude. However in a Vacuum it has the potential of going about 6600 meters. Also the falling speed is around 100 m/s but it leaves the barrel at about 360 m/s. That means, it looses over 90% of its energy due to air resistance. So if you can build a vacuum chamber that is about 7000 meters high, I am pretty sure that you will have a 9mm bullet falling as fast as it left the muzzle.

[J51004]

@ABCKorpi If you build that vacuum chamber, the bullet will never leave the gun because a sine qua non for the explosion will be lacking: oxygen.

[ABCKorpi]

@J51004 No the oxygen is already chemically bound in the powder. Or how else do you think it is possible to fire a gun under water? There is no free oxygen too.

And even if the oxygen whould be needed from the atmosphere the problem could easily be solved by putting the gun outside of the chamber and shooting through a self-sealing membrane.

[J51004]

@ABCKorpi I'm surprised to hear someone suggest that there's no oxygen in water.

[ABCKorpi]

@J51004 Chemically bound, yes. In solution in small quantities, yes. Free, gaseous, no. that's my point. at 20°C water contains maximum 9 mg Oxigen per liter. Air contains 440 mg oxigen per liter you see my point? still a cartridge burns just as fast if the gun is suspended in water as it does when the gun is in the air. If your theory should be correct, the burning rate of a cartridge should be minimum 44 times slower in a suspended gun.

[J51004]

@ABCKorpi That's very exciting. Thank you for sharing your knowledge!

[whitey211]

@J51004 Incorrect. There is air in the round itself and the round is airtight. It will fire regardless of there being oxygen in the atmosphere around it or not. The powder might not have enough oxygen to fire the gun at 100% efficiency, but I'd bet money it would have enough umph to at least make it out of the barrel, if not 100 yards down range.

[Crypt1cmyst1c]

as fast when it hit the ground...

[ajaxandcleon]

has the moon hit the earth? They will not hit the ground at the same time. The bullet being shot will be in orbit wile the bullet being dropped will just fall.

[Zangizo]

the floor is flat, the earth is round. it won't affect the bullet, it's too short a distance and they fall exactly the same length, if the distance would've been longer the bullet shot would have to fall further before it hit the ground, but still not much.

[zachattack4441]

Thats not what Newton thought.

[Obscurepatterns]

??? Gun powder as booster and air-friction

[zachattack4441]

It's in projectile motion not orbit.

[ajaxandcleon]

Then How does NASA put things into orbit?

[ajaxandcleon]

In true space with gravity pointing stright down not like a planet with a point of gravity but Only pointing in one direction ten Yes thebullet fired and dropped will hit at the same time. But the Earth has a pointof gravity. were gravity is at center th objectfired will try to pull awayfrom the center of gravity and enter orbit.

[8B6EB8]

the only reason something thrown hits the ground later than something dropped is that you give the thrown object upwards acceleration. forward acceleration doesnt give the bullet any force to make it stay in the air. so they hit the ground at the same time

[McFeta]

Acceleration is the same, -9.8m/s² down. The horizontal acceleration has no affect on the vertical acceleration and since both objects have the same mass they will both land at the same time. Gravity takes affect as soon as the bullet is not being held up by the barrel.

[metrkhope]

but then wouldnt the acceleration given to the bullet fired from the gun go faster due to the explosion caused when the bullet is fired?

[bbqueuezor]

@McFeta Unless the bullets used are prefectly round the one fired from the gun will produce positive lift due to its movement through the airmass, so it should hit the ground slightly after the dropped bullet, even from the heights that they were playing with in this video.

[Al3xGamble]

@McFeta Actually mass doesn't affect the time it takes to hit the ground, as long as gravity is the only force acting on an object - a projectile. And Horizontal has no acceleration, it is constant. At least that's what i have learned so far in AP Physics.

[titoANDdon]

No because the Acceleration is different on both objects. But if the net force was 0 then they would because its true Mass doesnt matter but Net Force and Acceleration does according to Newtons laws of motion

[Gameinggames]

so this is just advertismentß I want to see the entrie clip

[overkillll]

the force of the blast (plus the innertia of the spiral from the barrel) would carry the bullet horizontaly thus resisting gravity for a short time, wheras the verical bullet would succumb to gravity immidiately. right(?)

[Mmierks]

not if the gun was level

[overkillll]

I think it's assumed that the gun is perfectly level. I'm saying (theoretically)the inertia from the spin put on the bullet from the barrel would keep the bullet steadily traveling horizontally for a short amount of time, thus resisting gravity.

[HappytimeTom]

Wouldn't the bullet fired use its aerodynamics to push up?

[Dizzi800]

no. It has nothing to give it lift.

[HappytimeTom]

But wouldn't the pointy front of the bullet provide lift... like the front of a boat does... like i know it wouldn't be much... but surely it would make a difference?

[Dizzi800]

actually no. a boat is like a flattened out half-bullet. so it provides a little bit of lift. but since a bullet is not flattened nor in half it has no lift (any lift is generated to push up, would push it down just as much, negating the effect, because it is round)

[HappytimeTom]

Ahh... true.. good job... do you know the result of this myth in the end? its rather interesting... honestly i would think that the dropped bullet would land second...

[MedoKojiZiviOvde]

one goes at a same speed while the other accelerate

[METMAN92towhoknows]

Projectile motion states that vertical and horizontal movement are independent, just because you move a meter in the x axis doesn't mean you have moved at all in the y.

[Xxc0rrupti0nxX]

Even if the bullet didn't gain any lift the natural curvature of the earth would make the bullet fired hit the ground after the bullet dropped.

[ausguy33]

nothing should change because of rifiling in the barrel if you spun the bullet you drop it wouldnt change the effect of gravity it only changes the line the bullet takes

[tiagoaff2009]

que qualidade

[radudman]

you would never put a bullet into orbit. ever. unless its released from somethign IN orbit. no bullet travels fast enough to stay in orbit.

[serzhik]

Very simple. Would you rather have a bullet dropped down on your foot, or shot from a pistol? I mean, come on!

[Nivlac1982]

it isn't about force the bullet shot would have more inertia but it would still fall at the same rate.

[dbc616]

The high-speed shot of the actual final test in the full episode is soooo awesome!

[kshackleton]

Few guns are aimed level with the horizon. If you draw a straight line into space from the barrel, then calculate how far the projectile will drop from that line at any point along the way [given how long it takes to get to that point], that will give you the curve of the trajectory.

[iamthesungod]

watched this one last night, the bullet fired hit the ground 39.6 milliseconds later, but thats a small enough difference it counted as the same time.

[uut0]

i think that the dropped bullet will fall faster cause the fired one has more inertia to stay in the air then the dropped one

[theKing4720]

great video

[zq42black]

myths will fall?

I don't get it, is it becuase it's the season fall or what?

[pashaahsj]

almost the same as if he shaved his mustache off... :D

[luvmsiahatethegov]

So both bullets experience the same gravitational acceleration, but one has zero initial velocity, while the oher has a very high initial velocity.

Isn't the answer obvious?

[jokerpoker87]

well that's the myth - it may not be that obvious. the dropped bullet has Vy = 0 with Vx = 0 and the shot bullet has Vy = 0 with Vx = gun shot speed. Gravity works on the downwards (Y axis). Using the law of physics Vx and Vy are independent from each other. So if physics really that bad***, then the bullet and dropped bullet will land at the same time under the influence of gRAVITY!

[leezh92]

Don't forget that shot bullets are spun as they fly out due to the corkscrew groves in the barrel, creating the gyroscopic effect that keeps the bullet flying straight. The case might be different if you are talking about muskets and shotguns where the bullets are not spun.

[danclyde12]

i think you better watch the show....^_^...

i the results is really cool

[jokerpoker87]

Not to say you're wrong. Theoretically you're right

[pinoyboy579]

All in the name of Science

[GungnirStrike]

This is bad science.

[tato312]

c'mon FULL EPISODES damn it!

[saints360row]

@tato312 What do you expect? All they care about are ratings, and they aren't going to get many ratings for their network here on Youtube. Well, they will, but they won't get paid for it.

[cbale2000]

@saints360row Except YouTube has ad sharing for videos with high views... so they actually would get paid for it...

[saints360row]

@cbale2000 -Still not as much, though.

[lotussheath]

they shouldnt hit the ground at the same time since the shot bullet should arch its all about the resultant force since it would take longer for the bullet to drop

[kshackleton]

Well....both bullets accelerate toward the ground at the same rate, so if the distance is the same, and the trajectory starts out in line with the ground, they will hit at the same instant.

[ThePeeingGamer]

adam grew hair? wow

[jakemertz]

it should hit the ground at the same time, especially the higher they do it, because terminal velocity would only allow it to go so fast before the dropped on would catch up.

[thedcase]

so bloody obvious, of course they hit the ground at the same time!

[kansterstrak]

Its confirmed. The different was 59 milliseconds because of the drag.

[Fjarhultian]

If a dropped bullet moved at the same speed as a shot bullet, you'd have to go to the hospital for dropping a bullet on your foot.

[alvarojmarquez]

They're talking about vertical velocity, which, if the bullet doesn't have something to lift it, should be the same.

[Fjarhultian]

Awesome. So a gun doesn't actually accelerate a bullet if the barrel is pointed downwards?

[cumminsfan319]

it isnt point vertically it is shot perfectly level to the ground and it should hit at the same time on the ground

[Fjarhultian]

Ah, sorry! Ignore my other reply. I misunderstood the whole myth!

[gaswerti]

lol lol u thought just like i did when i first saw this myth and i didn't believe the gun doesn't accelerate the bullet when shot...

[alvarojmarquez]

Haha, no worries.

[Charbok12]

THERE RUNNING OUT OF IDEAS ALREADY.

[0YuriS0]

and youre running out of spelling books :(

[extremists123]

i can already tell that this one is not true...cuz the shot bullte will have some lift

[randomassockss]

god damnit i dont live in America, so gotta wait till freaking Australia buys these episodes, (or this season). >.>

[inofaith]

c'mon discovery show us FULL EPISODES... comedy central does it.

share the knowledge.

[ipodkiller6]

aww yeah the nerd in me is happy to see the mythbusters coming back!

[GundamAngelicDevil]

you guys are one of the reasons why I subscribed to Discovery. you're all awesome!

[kshackleton]

So, you should have learned that they would hit at the same time.

[xXSK83RXx]

SICK ASS

i still dont get it

[Laceytube3]

@jcaw it will be dropped exactly at the right time, trust me he said "If they are the same distance from the ground" its the same trust me

[Na8Dogg]

Smart parts SP1 paintball marker at 0:46...cool!

[AndrewsRanger]

allready saw this on discovery last week!!

[jaymac9456]

OMG I love this show!

[sillypotato9067]

mee too

[zacdee316]

If that is the case, then we should just drop pieces of lead from a plane. Basically the same effect.

[raiderjohn7932]

Its physics, it will happen, we learned this is Science class last year. no matter what you do, they will hit the ground at the same time.

[bigdude90]

Do you know this as a fact? All bullets have lift, that's why in the Marine Corps our m40a3s use 7.62x51, instead of 30-06. Same bullet, but the 7.62 has a smaller cartridge, producing less force and less lift than the 30-06, making for a more accurate shot. I don't know anything about this myth, and haven't seen the episode. Reply I'd like to know

[kshackleton]

Less lift? Perhaps less recoil to give more accurate shots. The bullet in flight produces negligible lift, it follows a ballistic trajectory.

[MrNiceGuy1090]

The reason that the two bullets have differing lift is because of the weight of the bullet. The myth is if two bullets of the same dimension and weight were shot and dropped, the two bullets would hit the ground and the exact same time.

[TimidALFONS0]

Was? It never was an episode, well not yet. these are previews to new episodes and a new season.

[Aamonath]

this is gonna be a cool episode

[Doppelgangergang]

What season will this be?

[idonthavetogivemynam]

they forgot momentum

[Bluzer86]

looks cool

[wolfpackaudio]

Ive been waiting for this one!

[Zeronombrezleft]

Cool show.

Nice "Crisp" picture!!!

[PillowDood]

people who ride segways are douchebags

[jmey107]

yea well they r just saying that they can have a segway and u can't

[IIGaMeSlaVe540II]

lol

[Tenocticatl]

But dude, it's an OFF-ROAD segway!

... yeah no you're right, there's no way you can be cool riding a segway.

[rabone1234]

surely this would only be true if the bullet that is dropped has time to reach terminal velocity

[int3rl0per]

And if the bullet fired had time to slow down to terminal velocity.

[comtraya101]

doesn't have to do with terminal velocity

this is more independence of x and y component

i agree with SAsgarters, the rotation should provide some lift

[howtowakeakar]

It doesn't make a difference, at least theoretically it shouldn't, because both the bullet fired and the bullet dropped are falling at the same rate, regardless of the forward velocity.

[z0mg1234]

since when did uhhh jamie i think have long hair (have not watched this in like 3 years)

[wildgeko123]

DiscoveryNetworks, When you upload mythbusters videos, can u please upload them with the answers for the people who maybe dont have time 2 watch it on tv or arnt able to? please

[knives254]

What about the people who do have time to watch them? It would be boring to know what the results are before watching the episodes.

[Snydes003]

.........NO

[mickderkskouta]

they will probably both have the same speed on impact with the ground but the fired bullet will have traveled more distance before reaching this speed.. therefore this is a myth to me =/

[zaq147369]

this is basic physics.

[kshackleton]

This is basic physics.

Both bullets will hit the ground at the same time so long as the barrel of the gun is level with the ground.

The only possible issue might be curvature of the planet....the fired bullet might actually have farther to fall.

[kshackleton]

I didn't note the part about the bullet travelling only 360 feet.....I guess the curvature of the planet will be no issue there.

:)

[SAsgarters]

I agree. However, the rotation of the fired bullet can actually give it some lift (the Magnus effect), although I doubt it would show in their tests.

[kshackleton]

Not really, unless of course there is a cross-wind. Then the lift could be negative.

[shadowman556]

busted

[SlicedSmoke14]

Can't wait!

[reeceybaber]

omg he looks a state man!!

[zamliman]

im 100% sure that this is a myth -.-

[fathead431]

last

[teh1wood]

first

[zaq147369]

fail

[yatudlabiereicit]

didnt they do this one already ?

[a4g0t3nF1ght3r]

They are doing it again