The Coriolis effect in action
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- เผยแพร่เมื่อ 12 ก.ค. 2018
- Alex is back in the lab to take a look at the Coriolis effect and demonstrate how this apparent force works.
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Thank you Helen! You spun that paper beautifully!
She turned the circle too quickly
You forgot to say thanks to Hellen👀
Yes you're right
And he is wrong
Thank you sooo much, that demonstration with the paper made it so clear. I didn't think of doing that. It is much appreciated!
Same
Just used this demo in my first year university enviro sci lab - thank you for the idea!
cheers fella , top bloke , also thanks Hellen
Very simple and precise..
Huge fan from Nepal
Thank you 👍🏻
Highly satisfied with you 👌👌👌👌
Thank you Helen
Thanks a lot.
Hello. What is the song in the background called?
Helen distracted me, didn’t get any of that.
Why would the wind goes straight(along the ruler), won't it rotate with earth following conservation of angular momentum?
pressure gradient makes the wind blow meridionally
The only way the wind would follow the earths rotation is if the atmosphere was far more sticky and any air particle would immediately follow the rotation of the earth. That violates the conservation of momentum, since the earth isn’t exerting a force to cause the air particle to change direction like that.
Another way to think of it is that because it appears to rotate in the earth frame IS conservation of angular momentum. The ball moving north leaving equator has a higher angular momentum than the surrounding ground. So, it would appear to be deflected from the grounds perspective.
thanks
The Coriolis effect requires 2 reference frames (inertial and non-inertial spinning reference frame). It doesn't involve imaginary hemispheres or hurricanes actually spinning. It's an apparent (not actual) deflection observed by the person in the non-inertial spinning reference frame viewing an object in the inertial reference frame. We never observe the Coriolis Effect while standing on the ground looking at objects in the air because earth is stationary.
The non inertial person doesn't notice deflection. And the earth is moving. What are you blithering on about.
@@rizzwan-42069 .If you wish to correct someone, correct someone. If you wish to be an asshole, try a different video.
@@marcochimio i do confuse inertial frames for some reason. i thought you could sus it out logically ima learn real quick which is which then i'll respond
@@marcochimio he's clearly a flat earther. while saying that the earth is stationary could be a correct statement it also means that the earth is an inertial frame. Being in an inertial frame means that we would actually see the apparent deflection, bc the earth is moving, but we act as if it's not. Apparently i can tell which is which by using logic.
@@marcochimio either that or he completely fumbled his explanation reading it which made think he was saying something else. nah i still can't tell "imaginary hemispheres" his comment is wrong, but i can't tell is he flat earth or does he have a misconception
Good explanation. Thx. What is the sound track to this vid?
It's from apple iMovie I think
Your arrow is curving to the right but the northern air currents are to the left (counter clockwise... like you say later), so it makes little sense to demonstrate it this way.
If you had a tub of water with a line of food colouring dots and then ran a knife through the water cutting the line of dots in two, then the resulting eddies in the water would represent the air/water currents and the knife represents the relatively faster air/water movement at the equator.
Northern Air currents do go right. Things like hurricanes go counterclockwise because the low pressure system at their center is pulling the wind in. As the winds all converge they all curve right, causing a counterclockwise turn.
There is one problem I am still feel very confused.
I clearly know that, in north hemisphere, the
wind will be bent to the right eventually, and the wind toward equator will generally be northeaster wind (There is also an gif in wiki page that can clearly show this).
The thing that I am struggling to figure out is the poleward wind. Why the poleward wind is not southeaster wind but southwester wind?
Even In the drawing on paper exercise in this video, it's clear that the poleward wind should be initially southeaster after leaving the equator (the edge of the circle)
One possible explanation I can come up with (but not sure correct or not) is that the speed of Earth's rotation is far larger than the wind speed, so the poleward wind will be dominated by right-bending effect and result in a generally southwestern wind pattern of poleward wind
The Earth's rotation when looking above the northern hemisphere is anticlockwise. At any point on the Earth's surface, there is a component of the Earth's rotation that is perpendicular to the surface (it is proportional to the sine of the latitude). This component is represented by the rotating piece of paper in the video. This rotation will be anticlockwise no matter which direction objects in the northern hemisphere are moving, so moving objects will be deflected to the right, whether they are moving towards or away from the equator.
Earth rotates clockwise. Imagine drawing a straight line while Earth rotates. Draw a line up (north) or down (south) both starting from the equator what way will the line go?
I don't get one thing: Why the opposite directions on north and south when the Earth rotates the same way on both sides?
While the earth does spin the same way on both sides, winds do not travel in the same direction on both sides. If wind is moving towards the Equator(which it usually does) from the North it would be moving in a Southerly direction and if it is moving towards the equator from the south it would be moving in a Northerly direction. Because of the different directions of movement the Coriolis Effect if inverted in the Southern Hemisphere when compared to the North.
The Earth rotates anti-clockwise when viewed from above the north pole. The Earth rotates clockwise when viewed from above the south pole. Opposite directions of rotation when looking over the poles mean the Coriolis effect acts in opposite directions in the two hemispheres, hence air in motion in the southern hemisphere is deflected to the left.
Most sensible & clearest explanation so far !@@adamlea6339
But air normally flows from high pressure pole to low pressure equator.. then ur demonstration need 2nd explanation.. please help!!
There is semi-permanent high pressure around 30N where the arid regions are located. The equator is characterised by low pressure. Air flows from 30N to the equator, high to low pressure as you say, but the Coriolis effect causes the air to be deflected to the right, which results in E/NEly winds in the sub-tropical regions instead of Nly winds, otherwise known as the trade winds.
Does air must blow straight
the pressure gradient makes the air blow relatively straight or, technically, in the meridional direction
My teacher showed us this video in class
Porque vai para Leste quando desce para o centro do disco
Many flat earthers were injured in the making of this video.
What makes the water stick to earth
gravity
@@garryclark6817 must be that theory of gravity 🤫
What makes butterflies stick to earth Jay?
Who’s her for class
That is not a demonstration of Coriolis.
What happens when a craft returns to earth from space? What does that trajectory look like?
Why are planes not affected by coriolis?
They are, and the Coriolis effect is accounted for in flight plans.
Must be hard as hell to land an airPLANE!
Nobody else seems to have caught it, but those lines are not the same. You swapped the papers lol.
The most important statement made in this video is "Coriolis is not a real force"
The Coriolis effect.....how do drones/helicopters hover?
Because they are traveling through space at the same speed as the ground under them. The angular velocity is the same.
@@user-gs8fe6fg1t Yes we are.
@@bobsmith3983 "travelling through space at the same speed as the ground under them" no they don't, they're hovering??.
@@bbskunk7052 Don't you know that the linear velocity of someone standing on the equator is about 1000 miles per hour? It's a fact. If you don't believe that you need to go back to school. Keep in mind that the earth is rotating on it's axis at a rotational rate of 360 degrees every 24 hours..
@@bobsmith3983 "linear velocity of someone standing on the equator" Not hovering above the earth then, like a drone/helicopter?
You would think earth's oceans would have the same type of affect especially when earth is moving at 1000 mph at the equator.
Sorry to tell you that you are explaining this wrong. The reason the wind moves east is do to its velocity and momentum. It is nothing to do with "point of view" or "appearance". If this was the case, as shown in your experiment, the wind would pull to the left at first. Pay close attention to your experiment and you will see how the line goes left in the first half (equator to north pole). It has to do with actual momentum physics. As the air moves north, because it is not attached to the earth, it doesn't lose its velocity/momentum as the earth below it does and so it actually "speeds past it" the more north it goes as the earth below it is actually getting slower and slower…but not the wind…until it cools down, sinks, and starts flowing south again.
No, this is entirely because of differences in reference frames.
Hurricanes appear to be deflected in pictures because the hurricane trail itself is a view of what the motion looks like from the Earth frame. If you took a video of an air parcel relative to the background stars overtime, the hurricane motion will look like straight lines.
Law of conservation of momentum applies, but you are using it incorrectly. If only works in the sense that it’s velocity doesn’t change over time, but it isn’t explaining the trajectories. What describes the trajectories on paper is simple coordinate frame conversion. No dynamics needed.
You are correct as the Coriolis effect is due to the linear velocities of the locations between one point on the earth and the next as seen from space.
@@aadiduggal1860 Nope. In fact, using a PEN tu illustrate is the wrong thing precisely because of the PHYSICS. A pen is not behaving in principle like the wind is.
@@bhaktalex Using a pen is exactly the same principle as what the wind is doing. The pen leaves a trace of its path as it follows its original trajectory. The wind is doing the same thing, but it’s leaving a trace in the form of condensation and clouds. The trace is compared to the rotating frame (earth or globe) and the result is the circular path you see.
@@aadiduggal1860 Nope. Think of it this way, the wind isn't dragging behind, or going slower as it moves north, thru conservation of momentum, it racing ahead of the earth below. The pen is dragging, and that is why he has to paint the line from equator to north pole and back to get his model to match up with how say aviation manual describe the effect on the wind of the coreolis. If you pay close attention to his example, the line is moving to the LEFT from equator to north pole.
This demostration is actually wrong, with the ruler and the pencil you're actually drawing a curve line to the east going north ... as yo're drawing for a whole 360° rotation of the paper disk the line eventually seems to go westward, but it's not.
In this demonstration the ruler represents the air or atmosphere and assumes the atmosphere does not spin with the earth. If this demonstration was a true representation of what is happening, we would have a constant wind at the same speed the earth is spinning. This demonstration is ridiculous.
No, the ruler represents the trajectory of moving objects on the Earth from the viewpoint of an observer looking directly overhead and in a non-rotating reference frame.
@@adamlea6339 The ruler is detached from the rotating paper, therefore it is completely detached from and not influenced by the rotating paper. The ruler must represent the atmosphere and the pen moving along the ruler represents a moving object just above the earth. But if the atmosphere is like the ruler, why is not a constant wind in the opposite direction of the rotation?
@@rockartalan because the earth doesn't rotate, it's actually stationary and all the governments around the world work together to fake their space programs to turn the public into obedient atheist slaves that love tyranny and hate God
Half of these comments are normal, the other half is people trying to sound smart and argue against this claim when in reality their argument can't even be started because the grammar and spelling are so bad that it's all unreadable.
agreed.
Even the Met Office succumb to the moronic music track.
This is almost completely useless and does zero to explain Coriolis effect. You would be less informed watching it than if you'd never watched it.
Who else is doing this for school?
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This is how many people are watching this for geography school work
Coriolis only applies to things that are turning. It cannot apply to earth. If it was why hurricanes and cyclones spin how they do, anticyclones would not exist....but they do. The direction of storms is caused by the movent of the sun over the earth and convection currents, not earth turning.
I agree. If the weather patterns were affected the the spin of the earth, the weather would be forced to move toward the equator, not away, because of centrifugal force.
No no, it applies to the earth. Coriolis is the conservation of angular momentum. It applies to the earth, you just have to think about it in 3 dimensions. If you start a parcel of air at the equator, the circle to think about is the width of the earth. If that parcel moves north, or south, the circle is smaller, and the latitude at which you are measuring. As the circle gets smaller, force is maintained.
@@matthewkurtz5129 Coriolis is NOT the conservation of angular momentum, you don't understand the defined term I'm afraid.
If it WAS the conservation of angular momentum, as you wrongly claim, there would be no perceived drift as the angular momentum would be conserved!!!
@@sleepingwarrior4618 you're wrong. Storms are caused by coriolis effect (sometimes) as are winds. It's an example of conservation of angular momementum. As the air parcel moves over the earth's surface, angular momentum is preserved, because at higher latitudes the air finds itself traveling over a smaller circle.
@@matthewkurtz5129 if storms were caused by Coriolis, planes must also be affected by the same thing. They are not affected at all, we checked.
Useless!
Why in south anticlock
If you look at the earth from over the South pole the Earth from that view would be rotating clockwise.