The Coriolis Force

[Benson429]

Obit

[NikesTube]

does not compute

[ultimatevideogamer01]

NERD

[plasticjesus108]

WHAT IF THEY WERE TURNING IN A CLOCKWISE DIRECTION SOUTH OF THE EQUATOR? WOULD THE BALL GO THE SAME WAY? AND WHAT IS THEY WERE SPINNING COUNTERCLOCKWISE NORTH OF THE EQUATOR?

[scyllaandcharybdis]

oh i think i get it now! the paths are always the same.. they just look different at a different perspective!

[banana3695]

it's not that the ball appears straight while above the merry-go-round but that the destination toward which the kid pushed the ball is achieved at the end of the spin or standing still

[koolkoollo]

Its straight from above because the ball is on the surface so its moving with the merry go round. If the ball was in the air the merry go round would move but the ball would go straight

[idm071]

To see that the ball is moving in a straight line (from above), only focus on the ball and the background, do not pay attention to the people on the merry go round or the merry go round itself.

[CFIsMyGod]

i'm in science class right now and that call of duty comment had me laughing out loud. good job dude

[wizardsofclay]

Dude, from above, it doesn't even look straight.

[op684]

Am I the only one who didn't perceive the path as straight from above?

[mikeyokinawa]

that path didnt look straight to me...

[Evolve451]

Part 5: So you either increase or decrease your centrifugal effect, moving you to a larger or smaller circle of rotation (N or S), causing the same deflection, just as spinning a weight on the end of an elastic band at different speeds would cause it to go around different size circles - faster=larger circle, slower=smaller circle. So it's not just an optical illusion as these videos imply, but a function of the conservation of angular momentum.

[TacticusPrime]

@Evolve451 But since all motion is relative to the observer, there is an element of "illusion" to it.

[Evolve451]

She doesn't actually speed up, she's just going around a smaller circle at the same speed, like a car going around a 100mile circular track at 100mph, compared to the same car going the same speed, but around a 10mile circular track - it goes around the smaller track more times in the same period, but it's still going the same speed - 100mph. When you go E or W, you increase or decrease your speed of rotation, because the Earth is already spinning to the E.

[Evolve451]

Part 3: The real explanation has to do with angular momentum. Changing latitude (going N or S) means moving to an area with a different angular momentum. Since your angular momentum (or think of it as speed of rotation) is conserved, you either pass or fall behind your intended target, because it either has a higher or lower speed of rotation than you. This is demonstrated when a figure skater pulls her arms in while spinning. She doesn't actually speed up, she's just going around a smaller c

[Evolve451]

Part 2: For example, if you look at the video here, youtube.com/watch?v=mcPs_OdQOY­U, you'll see a contradiction that arrises from this oversimplified explanation using a merry-go-round. It shows 3 scenarios: the ball thrown from center to edge, the ball thrown from edge to center, and the ball thrown from edge to edge. In #2, edge to center, they say that the reason for the apparent deflection is lateral momentum. But if that were true, it would happen in #3 as well, but it doesn't.

[Evolve451]

PawelKolasa, Coriolis Effect does have to be corrected for by artillery. The way to compensate is to aim in the opposite direction of the deflection.

You're right, there is no "Coriolis Force", but it also isn't as simple as saying that it's a mere difference in perception. The reason why it seems so is that the simplistic demonstrations and explanations usually given, such as on this video, aren't quite accurate. (end part 1)

[lekunberriko1]

very good. It´s astonishing to realize the movement from another frame.

[xMegzz]

BUENO!

[JeromeHattKronen1664]

Coriolis effect will also be big over small distances at very low speeds.

So a snail going in a straight line from Paris to Lyons will eventually end up in Dijon

[rowanbooker]

@JeromeHattKronen1664

No it wont, the snail is attached to the earth so it will spin with the earth, It only works with the object suspended in the air, not physically touching the earth, an airplane if traveling in a straight line between Paris and Lyons will end up in Dijon because the earth is rotating around the plane.

[JeromeHattKronen1664]

@rowanbooker I was thinking of a very slippery snail. (obviously)

And I could make the very same complaint about your aircraft, since it's attacherd to the air that it flies through, and it doesn't at all float freely in space.

[rowanbooker]

@JeromeHattKronen1664

Bear in mind your talking to a pilot, and yes we have to take Coriolis force into account when flying, we simply cannot fly a straight line to the destination. Adjustments must be made to account for it.

[JeromeHattKronen1664]

@rowanbooker ???

[efacilfacil]

Muito bom....tentei entender com livros, mas não deu.....o vídeo de vocês me salvou!

[xMegzz]

@efacilfacil O vídeo conservou-me, demasiado!

[PawelKolasa]

IF Coriolis force is real, woulnd't the artillery soldiers to account for it?

Myth has it, but does the REALITY?

HOW exactly is it implemented in a CANON?

I don't think so.

Now, Coriolis force is just PERCEPTION of an OBSERVER and therefore is NOT a real force at all, but a PERCEPTION of a trajectory.

And it's a perception of CENTRIFUGAL FORCE.

Again, Coriolis force doesn't exist, it's a PERCEPTION of a TRAJECTORY.

I'm the first to blow a whistle on this one.

[FALCO64125]

It's real in that it has an effect on everything since we live within a rotating point of reference (the rotating earth).

[xDarthPig]

@PawelKolasa WTF DO YOU MEAN IF

[gtamodman122]

@PawelKolasa of course the coriolis effect exists,many people experience it in their daily life there are so many damn examples about it and normal troops dont really have to take it into account as their main purpose is to fire at medium ranges so the bullett isnt really affected same thing happens with the cannons but sniper shots taken from loooong distances have a shiload of things which can affect the bullet one of them is the coriolis force

[WretchedDrake]

It is caused by the rotation of the earth.

That is, if the Earth were not rotating there

would be no Coriolis Force.

Also, if there were no wind, there would be no Coriolis Force

The Coriolis force can only deflect air that is already in motion. It cannot put an air parcel in motion.

Get it now?

[douggieboi07]

wind has no effect, this would happen in a vacuum...

[Vahntronoy]

if there was no wind there would still be the coriolis force

[ArmandoXIII]

You are so fucking wrong wtf

[WretchedDrake]

Then fucking explain it to me because I go to Northern Illinois University and I had 2 atmospheric classes that said the same shit. I even copied that from a lecture powerpoint slide.

[xDarthPig]

@WretchedDrake wind doesnt make a difference retard

[ItzMyron]

does th force work without gravity or air?

[GrifOli]

Gravity is another fictitious force that acts on a body in a non-inertial frame of reference (like the Coriolis force).

The best way you can "see" a pure force is when there is only that force that is acting on a body. So the Coriolis force would be more predictable if there wasn't air drag and friction (friction is due to gravity).

But be careful because fictitious force do not always obey the Newton's 3rd law (read about quantum mechanics).

[necrojam]

No gravity would be there even if the earth is stationary.

[TakesTwoToTango]

Diff question. It's not a force...

It stands loose of gravity and air and w/e. But it is not a real force, the ppl on the wheel are just in an accelerating frame of reverence (thus a non-inertial one). That means the laws of newton don't apply there. The force is just an operator you apply to all objects in order to acheive an inertial frame of reference, thus getting a system where the laws of newton are valid, but strange things appear to happen.

[imp339]

this video is confusing..try watching another one because the ball seems to curve when ur watching from above...

[GrifOli]

Eum no, this video isn't confusing at all. Watch the guy in yellow passing the ball. The ball follows a perfect straight line from 0:03 to 0:04. Watch it again, because you missed it.

[scyllaandcharybdis]

i've seen this video 29 times now and i still don't understand it!

[waynesbeck]

the bullit will curve right cos your in the northern hemispere. opposite applies in the southern hemisphere.

when the wind is blowin slightly to the left you can pull off a direct shot due to the coriolis effect.

[LtChicken]

i think mcmillan was implying that rotation of the earth itself will affect your bullet's course at that distance. thats all i can really gather from this lol

[CmagsProductions]

very cool

[schuegrafma]

Like others, I also researched this because I wanted to know what McMillan was trying to tell me in the sniping COD4 mission.

Now after watching this video I have one question directed at anyone who knows how to answer it: how does the coriolis force affect the path of a bullet and where do you have to aim to undo its effect?

[jaappdc]

The coriolis "force" affect the bullet because the bullet is moving in a rotating surface, remember that the earth is rotating and in the case of a sniper, the bullet has to travel a long distance that is the reason the sniper has to considered the coriolis "force" and so do airplanes when travel long distances. Sorry for my english xD

[schuegrafma]

No problem its not bad I've heard worse ^^

Thanks for the info thats why then. But if I'm aiming at Al Asads head in COD, how do I make sure I am taking the coriolis force into account?

[jaappdc]

Well imaging an airplane that has to go from LA to London, if the pilot don't considered the coriolis effect he might ended up in another place because London "move" from its original place related to the time it was when the airplane leaves LA.

Sniper rounds will not appear to fly in a straight line from the shooter to the target because of the rotation of the Earth on its axis. Rather, the round or shell will appear to curve. But this effect only is appreciable in distance longer than 2000m

[nexus1g]

You're in the northern hemisphere in CoD4 and therefore the bullet will go to the left. In the southern hemisphere, it's opposite.

[schuegrafma]

Thanks a lot - was waiting for this.

[Scyeth]

in soviet russia, bullet curves the hemisphere!

[TakesTwoToTango]

in short: don't. Video games don't calculate the coriolis force into the trajectaries of objects. Though irl you should know what direction you're shooting in. If you're shooting to the east or west, there's no effect. If you're shooting to the north the bullet will appear to bend to the left, to the south it will appear to bend to the right. So if your target is north of you, aim right of his head. If he's south of you, aim left of his head. Be aware the effect is small over small distances.

[giggscruz1220]

it was that great "All Ghillied Up" mission from COD4 that made me research this

[peepsOFdamnation]

cool effects

[musli4brekkies]

Sweet.

I want a merry-go-round to do that on now.

Shame i'd be labeled a pedo if I went down to the playground.

[godly04]

THis already is a demonstration of Coriolis on ballistics.. just replace ball with bullet........

Also there's no real point in caring about the coriolis effect if for instance, you were a sniper.. since it isn't noticable inside of a distance of about 1000 yards.

[JoeyStoned]

God damn geography test.. I've been sitting on the sofa for 6 hours and my ass hurts >_> There's so much to learn but so hard to understand some of the facts..

[DLatezT]

Lol the One Shot, One Kill mission in Call of Duty 4 is what actually made me research this.. i had never heard of it before then

[brunoistheonetruegod]

it sucks far more when you have to research it for your homework :p

[Q2w3e3w2q]

@brunoistheonetruegod Yeah, becauce knowledge is dangerous, right?

[krismancool]

@brunoistheonetruegod I doubt it.

[CoolCalmJames]

hehe same here.

[millacol88]

lol same here. :P

[sheadong]

me too lol.

[yugiohabridgedman123]

here aswell... :s school sucks

[yugiohabridgedman123]

me 2 lol

macmillan says: this is where the coriolisis effect kicks i, boy.

something like tht

[JTCLOUTIER13]

thats y i searched this

[theladysman13x3]

a bullet

[2204kayh]

This is my homework. :(

[TroyaE117]

Good experiment, well-explained.

[NeoPrakrti]

Since when was the Coriolis effect a myth? Or is the movement of water the myth? Because from what I understand the effect is exerted on things moving [at a certain speed] above the surface due to the earth's rotation.

[Qtyled]

The coriolis force is a fictitious force as it only exists in a non-inertial frame of referance (the video demonstrates this - for an observer independent of the Earth there is no force, the earth simply rotates in the time it has taken for the object to get there).

The coriolis effect is real, the effect being deflection, from our perspective, due to the fact that we are on a rotating body.

[NeoPrakrti]

Oh okay. I misunderstood. Coriolis effect vs Coriolis force.

[gilgtc]

this is excellent. well done.

[ACMilan57]

is it just me or when i see the above view i dont see the ball going straight?

[Lacadef]

you are correct, but its because the way that the kid is throwing the ball, not because of the spin of the merry-go-round

[yujiroabc123]

It's not just you, but it's just an illusion, if you note the "place of origin" of the throw (in the outside observer's frame) you'll see that it's straight from there.

[Necron3211]

In One Shot, One Kill in Call of Duty 4, when you had to snipe the guy from a distance, he said to take the Coriolis Effect into account :) Dunno if it actually did anything but I still blew his arm off.

[cheese319]

@Necron3211 Yes the bullet traveled slightly to the right without the wind.

[legsi104]

@Necron3211 true, even when you hit his other arm, his body, head etc. It was because of COD4 that I watched this.

[caomaco]

Sorry, fictitious.

[caomaco]

It's a fictious force, so both terms are legit.

[payasodemencial]

Esto sucede cuando estas en la base que gira, si estubieras afuera notarias que el balon sigue un curso linial, es por eso que se denomina una fuerza ficticia a coriolis

[TweetyTasmania]

Put something on coriolis effect in ballistics

[amosslee]

Well, technically it is the Coriolis "effect", not "force". Forces cause a change in the motion of an object. The ball is traveling in a straight line (no force) while the merry go round is moving underneath it.

[FIFA07Addicted]

yeah true. is an effect not a force

[magicmaniacs11]

...tion

[Duldul601]

Thanks!! this is the best video for Coriolis effect.Pls don't be misunderstood by those other videos.

[Myiuki]

ach. I still don't get it.

[BeforeShock]

hey i been scratching my head for hours, but i just got it. imagine your sat in your chair with a pen. without moving your body move the pen forward, then pen appears to go straight yes? Then do the same thing but spin your body from right to left, and the pen looks to curve!

[themaheep]

@BeforeShock makes no sense, sorry

[cupid1984]

lol. we were shown this at our lecture.

[Kirk80797]

finally a good example for the coriolis effect!!! forget the other shit around youtube - if you want to understand what it is, watch this video - or try it yourself!

[sangol]

Where did you extract this video? any science documental? i'm interested, thanks

[SoFoSTheWise]

You can get the video from here:

tinyurl[DOT]com[SLASH]28q438

[FifthDegree]

omg cool!