the science centre in my home state used sand on the floor that the pendulum traced through and you could see the path it left. I'm unsure how they compensated for the subsequent friction increase. it was really pretty though.
The globe works with magnetic resistance. there's magnets that repel each other with equal force in the top and bottom and corresponding in the globe, which is basically magnetically "squeezed" between the two. I'm sure you can find something similar at any learning shop or the discovery channel store or catalogue. one must remember the earth's axis is tilted too, so that changes the experiment a tiny bit.
Regarding open flames and the Antarctic Treaty - Stating article: phys-astro.sonoma.edu/graduates/baker/southpolefoucault.html "Since it is against the Antarctica Treaty to have any open flames at the South Pole we could not do this" (second textmass from the bottom) - The treaty itself: scar.org/treaty/at_text.html - Possible cause: antarcticsun.usap.gov/pastIssues/1996-1997/1996_10_27.pdf
If the pendulum was suspended from a track and the track was parallel to the equator, and the pendulum was swung perpendicular to the equator, would the pivot point of the pendulum move along the track? Meaning the earth would move independant of the mass of the pendulum? Since the pendulums mass is moving faster in an oblique direction. Of course you know which direction the earth rotates, the sun rises in the east and sets in the west. Its this perpendicular movement which changes the angle
hi, i have a doubt. i wanted to know in what or where can we find a foucault pendulum...i have searched and realized that the largest ceiling clock is a foucault pendulum and also it is used in seismographers, but i wanted to know in what else...please answer me back as soon as possible
@Jeeve79 The pendulum is not affected by the rotation of the Earth. As shown in the video, the plane of the oscillation of the pendulum is constant and so the pendulum is moving in an inertial reference frame.
Very cool. There is one of these at the Maryland Science Center. I remember it as a child...now I want to go back and see it again, understanding what it actually is.
@tvalerianopereira Try it yourself with your own pendulum. Get a heavy weight and set it in motion, then manually twist the apparatus round 360 degrees yourself and watch what happens. I don't think the plane that the pendulum moves in should or will change, and it's the same when the earth rotates.
@Nilguiri I have to be perfectly honest and say that until you mentioned it and made me read bout it, I'd never heard of it. It's interesting though, but too soon for me to have contemplated it. I was purely using Einstein's relativistic ideas to base my assumption on.
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This is absurd. The Earth is stationary. The Foucault Pendulum does not prove that the Earth is moving. Do you realize that according to “science”, the Earth is traveling at speeds exceeding 400,000 mph? C’mon, do you really believe that we are traveling at speeds exceeding 400,000 mph? I sure don’t.
@dmh497 Well, light itself takes a few minutes to get here from the Sun at 180,000 miles per second, so the Earth has to go kinda fast to travel all the way around the Sun in one year. We don't notice it because we're going at the same speed, and so we were even before we were born. Like when you're in a plane and once it takes off you don't even feel like you're moving.
@yondaime500 It’s the sun that orbits the Earth. This has been witnessed daily by everyone who has ever lived. Heliocentricity is not real science. And it’s not just the orbital speed that we’re all told to accept as fact. We’re also expected to believe that the whole solar system is traveling at speeds exceeding 400,000 mph.
We don’t feel the speed in an airplane because it is an enclosed area. If we removed the roof of the airplane, we would definitely feel the speed.
@dmh497 We wouldn't feel the speed of the airplane, we would feel the air coming against us, or more precisely, we would bump against the air particles because they're not going as fast as the plane. But, of course, there's no air in space for us to bump into. Well, I'm done reasoning with you. You're are probably not serious anyway. If you are, Galileo already won this argument over 300 years ago. Go read his work, or Kepler's, or Newton's.
@dmh497 You are pre-Copernican in your views. The Earth does not move but the Sun goes around the Earth? How does the Foucault pendulum rotate its plane of oscillation if the Earth is stationary? Over to you to give an expanation.
@MrOldprof Regarding the Foucault pendulum: I think that it’s nothing more than a parlor trick designed specifically to trick people into believing that it’s been proved that the Earth is rotating. There are a variety of ways to explain the oscillation, including foul play. I doubt if anybody at home would get results that prove anything.
@MrOldprof An airplane traveling at a constant speed from the east coast to the west coast takes the same amount of time as it takes to travel from the west coast to the east coast. How can this be possible if the Earth is rotating on it’s axis at 1000 mph (at the equator)? If the answer is “the atmosphere”, can you explain how this works using math? For example, at higher altitudes, as the atmosphere thins, does the time differential change? If so, at what rate?
@MrOldprof Actually, Tycho Brahe came after Copernicus. Tycho was one of the greatest astronomers of all time. He believed that the sun orbits a stationary Earth. And the circumstances surrounding Tycho’s death are very suspicious. It appears that he died of Mercury poisoning. Kepler was his assistant. They were not on friendly terms. After his death, Kepler took and used Tycho’s data to make assertions that went against Tycho’s convictions regarding the data.
Tell me, just how deep does your little rabbit hole go? If geocentrism is a big conspiracy, what next? Are you a flat-earther? Are you a creationist? Do you believe that space is really a solid sphere or curtain? Do you believe that reptilians secretly run the world?
@1RadicalOne Yes, I believe in God. No, I don’t believe in outer space aliens or a flat Earth. Why don’t you tell us how deep your rabbit hole goes? Do you believe in outer space aliens? And just how fast do you believe the Earth is traveling? 500,000 mph? 1,000,000 mph? Also, do you believe that men have walked on the moon?
Do you believe everything that “scientists” tell you?
You probably think that reply somehow exonerates you. In actual fact, it burys you deeper (though admittedly not as far as being a flat-earther would).
Answering your questions:
1) Alien life somewhere in the universe is extremely likely given the number of planets out there.
2) Doing the math yields 29400 meters per second, or 105840 kph, or 66150 mph. Far less than your strawman value.
As for Luna, see my first sentence.
Not everything is a big evil NWO conspiracy, you know.
@1RadicalOne “You probably think that reply somehow exonerates you.”
I don’t need exonerating. I’ve got science on my side. You don’t have science on your side. And if you believe that men have walked on the moon, then you are a very gullible person who does not see things very clearly. By now, most people who are able to see clearly realize that we did not really put men on the moon.
@1RadicalOne 66,000 mph is the alleged speed that the Earth is traveling around the sun. But in addition to that speed, we are also told by “scientists” that the whole “solar system” is traveling through the Milky Way at speeds exceeding 400,000 mph. And on top of that, we’re told that the Milky Way is traveling through the universe at speeds exceeding 400,000 mph. Are you saying that you believe in the alleged orbital speed but not those other alleged speeds?
Tell me, why exactly is it that you do not believe this? Your "you would feel this" is simply false, as space is a vacuum and since the accelerations are virtually zero, so are the inertial forces.
Is it simply an aversion to believing what the authorities on the subject say?
@dmh497 This experiment is concerned with rotation, i.e. change of direction- not simply speed, as you have referenced. As it takes 200 million years to orbit the milky way. You will not see the effect of galactic rotation on the pendulum.
@dmh497 you do realise that this effect has nothing to do with the earth's movement through space? it concerns the earth's rotation, with a movement that the experiment is tethered to by being on the ground. it would be most noticable on the planatary axis, where centrifical force is at its strongest, although it would be noted on the equator if you started the pendulem from north to south.
So if you were dropped on an unknown point on the planet, you could rig up a ghetto Foucault's Pendulum, time how long it takes to do 360 degrees, note what direction it was rotating and work out your latitude, yeah?
There appears to me to be two assumptions made in this experiment. First is that the only forces acting on the pendulum are gravity and friction. (And gravity is itself an assumption.) No other forces are considered. The second assumption is that the gravity vector field doesn't have a curl.
the one at work (radboud university of nijmegen) is driven by a clever magnet setup and during the day you can see the effect which is very cool indeed
@oisiaa This is Roger Bowley, the professor who does not know which way the world spins. So I screwed up --- it's hard to get everything right when improvising for the camera.
@MrOldprof My deepest apologies sir. I seriously respect your knowledge and absolutely love watching you on Sixty Symbols. It was my error to point out such a simple mistake that anyone could make.
I still remember when I first saw this thing vividly in London Scientific museum. I was shocked. We now could think of many crazy ways of demonstrating the Earth's rotation, but who can imagine someone did this long before space age, in such an elegant way? If I saw this when I was much younger and somehow understood it, I would have become a scientist.
@Austyg "How can the pendulum change direction of swing with respect to ground while its tripod is attached to the ground?"
.
Because, ahem, the ground is moving. The whole frame of reference thing is very confusing, well, to me anyway. I believe that in principle someone might try to argue that the Earth is static and everything else moves very strangely around it. But this pendulum shows that the earth is really spinning. It's a bit like holding a pendulum on a kiddies roundabout/carousel.
Austyg, you asked one of the more sensible questions here. key to accuracy of any such pendulum is a free suspension allowing low-friction rotational movement between the mount and the bob cable. some friction remains in any mechanical connection, but it's vastly overpowered by the force of the pendulum. supposedly, the original by foucault had no such suspension, so the cable would torque up with twist. still, it was apparently a negligible error compared to any indication of earth's rotation.
When the pendulum is set to start it has the same angular speed as the earth beneath it. And as soon as you start the pendulum this angular speed drops to zero. How?
Now I am wondering what would happen if a hurricane crosses the equator. Would the Coriolis forces cause to the hurricane to become disorganized and dissipate?
For the direction of the tangential velocity you can use a right-hand-grip-rule... if you imagine your thumb is in the same direction as the vector of the connection of the geografical southpole to the geografical northpole your fingers show in the same direction as the tangential velocity of the earth...
Could you please explain inertial reference frames please? I mean I understand what an inertial frame of reference is but... why the distant stars? Why is the pendulum stationary with respect to them and not to something else? I have been thinking about this for ages and can't come to a reasonable conclusion. It's as though these stars were special, but I suppose even if you went really close to one of them you would still think about other stars as being distant.
@eltotoX Because the stars experience such a small acceleration as they orbit the galaxy, using them as a reference is a very good approximation to an inertial reference frame (non-accelerating, non-rotating). The stars aren't special, they just make a useful reference. Hope that helps.
@eltotoX He talks about stars because to us they appear to be immobile - at least immobile over 24 hours. The only motion the average person can detect from stars is actually the movement of the Earth. Of course in reality they are moving in all different directions also.
I can understand why the pendulum rotates when it is placed along the Earth's axis, but I can't figure out why it rotates when placed at say 45 degrees to a pole.
@Kargoneth Try to imagine it with Vector Forces, If at the poles the Force acts directly perpendicular on the pendulum making it rotate, and at the equator it acts parallel to the pendulum motion, in between both of them, the force should be on an angle which still causes it to rotate around.
@mrblisterfist counterclockwise is used for 2D but what's used for 3D? if the earth rotates counterclockwise from the north pole, it is the opposite direction from the south pole.
I've just seen this pendulum being demonstrated by James Burke (connections 3). I totally remember learning about it at school but I'd forgotten that the point of it is that that the pendulum is independent to the rotation of the Earth. Amazing! (when I forget which way the Earth rotates I simply remember that the sun rises in the east... so the Earth rotates towards the east... the other way to this video:D)
I've just searched through the full text of the antarctic treaty and I can't find any reference to the prohibition of open flames.
I have read Allan Baker's website about the experience/experiment and he does indeed state that it is against the treaty.
Anyone have anymore information about this? Seems strange to forbid the use of fire in this manner when the second article of the treaty supports 'freedom of scientific investigation'.
1. Try to predict which way the water should rotate.
2. Look at how one toilet behaves. Make a note of this.
3. Repeat step 2 several times with different toilets.
4. Take a look at your notes. You should find that the water rotates 50% of the time in one direction and 50% in the other. Give or take a bit for random behaviour. 50% chance that your prediction predicts which way the water goes the majority of the time.
@rjhrjh3 but the reason a toilet drains one way or the other is most often due to the design of the toilet itself. It's designed to encourage the water in one direction or the other..
I would suspect there's not that many designs for toilets and some toilets would be more popular than others and as such you wouldn't get a 50/50 split...
@physicsbugga wind is a factor to include on this myth something of larger scale like a hurricane vortex do they form in different direction depending side of equator they begin ?
@okuma0kuma I don't think so, the effect of the Earth's rotation is very slight (360 degrees in 24 hours). The force of gravity of say the moon is much stronger I'd say - you get tides from that. I'm no expert, but I think that's what the scientists say on the subject. Oh and the centrifugal force produced by the Earth's rotation will also have a greater effect (conversely on the equator and 0 on the poles):
@8DX As well as obvious gravity but wind / pressure is a factor on the pool of water surface weather it is high or low i think it is part of coriolis effect isnt it !
@rjhrjh3 Toilets are designed with the intention of water too rotate, not just enter straight down into the center of the bowl. The nozzles are angled.
@carlsontechnology I would say it depends on the toilet not on which hemisphere it's located. A toilet wouldn't swirl at all if it wasn't designed to.
@mvszao as far as I can tell it uses a 1 magnet in the stand, the top of the globe has some type of metal probably steel or iron and a electric force which i assume flips the fields so quickly that it repels and attracts so that it can not move.
I can visualise why it works at the Poles and not at the Equator but for all the middle latitudes all I can do is a mathematical interpolation. I've never really managed a proper mental image of what is happening.
In a similar but different kind of way, this reminds me of the Coriolis effect.
the science centre in my home state used sand on the floor that the pendulum traced through and you could see the path it left. I'm unsure how they compensated for the subsequent friction increase. it was really pretty though.
subgirl 2 weeks ago
The globe works with magnetic resistance. there's magnets that repel each other with equal force in the top and bottom and corresponding in the globe, which is basically magnetically "squeezed" between the two. I'm sure you can find something similar at any learning shop or the discovery channel store or catalogue. one must remember the earth's axis is tilted too, so that changes the experiment a tiny bit.
subgirl 2 weeks ago
otur1 1 month ago
Can I ask where the levitating globe was bought? @sixtysymbols
TheCarnun 1 month ago
If the pendulum was suspended from a track and the track was parallel to the equator, and the pendulum was swung perpendicular to the equator, would the pivot point of the pendulum move along the track? Meaning the earth would move independant of the mass of the pendulum? Since the pendulums mass is moving faster in an oblique direction. Of course you know which direction the earth rotates, the sun rises in the east and sets in the west. Its this perpendicular movement which changes the angle
tiredfingers99 2 months ago
Let´s say thare is plane which is flying around the world, from north pole to south pole to north to south...and so on...Could we see same effect ?
tomaskvapil 2 months ago
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tomaskvapil 2 months ago
dat backside
JGSagain 2 months ago
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hi, i have a doubt. i wanted to know in what or where can we find a foucault pendulum...i have searched and realized that the largest ceiling clock is a foucault pendulum and also it is used in seismographers, but i wanted to know in what else...please answer me back as soon as possible
jorge210594 2 months ago
I like how smart people who use their brain a lot forget the inconsequential stuff that doesn't matter for their disciplines.
Sherlock Holmes forgets his planetary system has 9 planets.
This guy forgets which way the Earth rotates
aureusyarara 2 months ago
"i can't remember which way the earth rotates" for the lol
MultiCheeseGrater 4 months ago 16
but when its released, the earth is already rotating?
or does that rotation doesn't count towards the pedelum motion?
Jeeve79 4 months ago
@Jeeve79 The pendulum is not affected by the rotation of the Earth. As shown in the video, the plane of the oscillation of the pendulum is constant and so the pendulum is moving in an inertial reference frame.
xbox360player88 4 months ago
Very cool. There is one of these at the Maryland Science Center. I remember it as a child...now I want to go back and see it again, understanding what it actually is.
300Z31 5 months ago
Howcome the earth's rotation is not transmited to the pendulum through its fixing point?
tvalerianopereira 5 months ago
@tvalerianopereira Try it yourself with your own pendulum. Get a heavy weight and set it in motion, then manually twist the apparatus round 360 degrees yourself and watch what happens. I don't think the plane that the pendulum moves in should or will change, and it's the same when the earth rotates.
wowsa0 5 months ago
The big church in our city also has this demonstration. Pretty cool actually.
BarneySaysHi 7 months ago
earth rotates to the right not to the left :)
walter3241 7 months ago
Wasn't this experiment conducted with a little 'tap' or constant drip which drew the change in direction over time to show the results?
tiger55331 9 months ago
Wonderful! Thank you.
davehorne 9 months ago
That is raw how that earth model was rotating at 4:38. IN THIN AIR!!!
h20DDs 9 months ago 3
@h20DDs Magnets were used.
Aviatorsmith 5 months ago
Anyone know what a "Foucault Gyroscope" would do?
(btw.... the sun sets in the west, so viewed from above the north pole, the earth rotates counter-clockwise.)
looksintolasers 10 months ago
just asking but would it go clockwise or anti clockwise?
bwmacca 10 months ago
how was the globe just levitating and rotating at the same time?
MrLondontramp 10 months ago 2
@MrLondontramp i would like to know too!
catsfromhell1 10 months ago
@MrLondontramp
magic
lewaan 10 months ago
@MrLondontramp Fucking magnets, how do they work?
NietzscheanMan 7 months ago 8
nice butt thx!
slowmopoke 10 months ago
why cant he not use fire in the south pole that just stupid
BENJAMINYE23 11 months ago
What happens to it during a total eclipse of the sun?
Nilguiri 11 months ago
@Nilguiri It'd behave the same
wesmatron 10 months ago
@wesmatron
Do you think the Allais effect is a myth? It certainly seems ridiculous, but has it been definitively ruled out?
Nilguiri 10 months ago
@Nilguiri I have to be perfectly honest and say that until you mentioned it and made me read bout it, I'd never heard of it. It's interesting though, but too soon for me to have contemplated it. I was purely using Einstein's relativistic ideas to base my assumption on.
wesmatron 10 months ago
0:54 epic fail
jasonguyperson 1 year ago
Yeah, he spins the globe the wrong way.
Sun rises in the east.
Xethavosh 1 year ago
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This is absurd. The Earth is stationary. The Foucault Pendulum does not prove that the Earth is moving. Do you realize that according to “science”, the Earth is traveling at speeds exceeding 400,000 mph? C’mon, do you really believe that we are traveling at speeds exceeding 400,000 mph? I sure don’t.
dmh497 1 year ago
@dmh497 Well, light itself takes a few minutes to get here from the Sun at 180,000 miles per second, so the Earth has to go kinda fast to travel all the way around the Sun in one year. We don't notice it because we're going at the same speed, and so we were even before we were born. Like when you're in a plane and once it takes off you don't even feel like you're moving.
yondaime500 1 year ago
@yondaime500 It’s the sun that orbits the Earth. This has been witnessed daily by everyone who has ever lived. Heliocentricity is not real science. And it’s not just the orbital speed that we’re all told to accept as fact. We’re also expected to believe that the whole solar system is traveling at speeds exceeding 400,000 mph.
We don’t feel the speed in an airplane because it is an enclosed area. If we removed the roof of the airplane, we would definitely feel the speed.
dmh497 1 year ago
@dmh497 We wouldn't feel the speed of the airplane, we would feel the air coming against us, or more precisely, we would bump against the air particles because they're not going as fast as the plane. But, of course, there's no air in space for us to bump into. Well, I'm done reasoning with you. You're are probably not serious anyway. If you are, Galileo already won this argument over 300 years ago. Go read his work, or Kepler's, or Newton's.
yondaime500 1 year ago
@dmh497 You are pre-Copernican in your views. The Earth does not move but the Sun goes around the Earth? How does the Foucault pendulum rotate its plane of oscillation if the Earth is stationary? Over to you to give an expanation.
MrOldprof 1 year ago
@MrOldprof Regarding the Foucault pendulum: I think that it’s nothing more than a parlor trick designed specifically to trick people into believing that it’s been proved that the Earth is rotating. There are a variety of ways to explain the oscillation, including foul play. I doubt if anybody at home would get results that prove anything.
dmh497 1 year ago
@MrOldprof An airplane traveling at a constant speed from the east coast to the west coast takes the same amount of time as it takes to travel from the west coast to the east coast. How can this be possible if the Earth is rotating on it’s axis at 1000 mph (at the equator)? If the answer is “the atmosphere”, can you explain how this works using math? For example, at higher altitudes, as the atmosphere thins, does the time differential change? If so, at what rate?
dmh497 1 year ago
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dmh497 1 year ago
@MrOldprof Actually, Tycho Brahe came after Copernicus. Tycho was one of the greatest astronomers of all time. He believed that the sun orbits a stationary Earth. And the circumstances surrounding Tycho’s death are very suspicious. It appears that he died of Mercury poisoning. Kepler was his assistant. They were not on friendly terms. After his death, Kepler took and used Tycho’s data to make assertions that went against Tycho’s convictions regarding the data.
dmh497 1 year ago
Tell me, just how deep does your little rabbit hole go? If geocentrism is a big conspiracy, what next? Are you a flat-earther? Are you a creationist? Do you believe that space is really a solid sphere or curtain? Do you believe that reptilians secretly run the world?
1RadicalOne 1 year ago
@1RadicalOne Yes, I believe in God. No, I don’t believe in outer space aliens or a flat Earth. Why don’t you tell us how deep your rabbit hole goes? Do you believe in outer space aliens? And just how fast do you believe the Earth is traveling? 500,000 mph? 1,000,000 mph? Also, do you believe that men have walked on the moon?
Do you believe everything that “scientists” tell you?
dmh497 1 year ago
You probably think that reply somehow exonerates you. In actual fact, it burys you deeper (though admittedly not as far as being a flat-earther would).
Answering your questions:
1) Alien life somewhere in the universe is extremely likely given the number of planets out there.
2) Doing the math yields 29400 meters per second, or 105840 kph, or 66150 mph. Far less than your strawman value.
As for Luna, see my first sentence.
Not everything is a big evil NWO conspiracy, you know.
1RadicalOne 1 year ago
@1RadicalOne “You probably think that reply somehow exonerates you.”
I don’t need exonerating. I’ve got science on my side. You don’t have science on your side. And if you believe that men have walked on the moon, then you are a very gullible person who does not see things very clearly. By now, most people who are able to see clearly realize that we did not really put men on the moon.
dmh497 1 year ago
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"I don’t need exonerating. I’ve got science on my side."
If that were true, you would not be forced to claim that all the agreement among scientists that disagrees with you is some vast conspiracy.
1RadicalOne 1 year ago
@1RadicalOne 66,000 mph is the alleged speed that the Earth is traveling around the sun. But in addition to that speed, we are also told by “scientists” that the whole “solar system” is traveling through the Milky Way at speeds exceeding 400,000 mph. And on top of that, we’re told that the Milky Way is traveling through the universe at speeds exceeding 400,000 mph. Are you saying that you believe in the alleged orbital speed but not those other alleged speeds?
dmh497 1 year ago
Tell me, why exactly is it that you do not believe this? Your "you would feel this" is simply false, as space is a vacuum and since the accelerations are virtually zero, so are the inertial forces.
Is it simply an aversion to believing what the authorities on the subject say?
1RadicalOne 1 year ago
@dmh497 This experiment is concerned with rotation, i.e. change of direction- not simply speed, as you have referenced. As it takes 200 million years to orbit the milky way. You will not see the effect of galactic rotation on the pendulum.
Tossphate 1 year ago
@dmh497 you do realise that this effect has nothing to do with the earth's movement through space? it concerns the earth's rotation, with a movement that the experiment is tethered to by being on the ground. it would be most noticable on the planatary axis, where centrifical force is at its strongest, although it would be noted on the equator if you started the pendulem from north to south.
kght222 1 year ago
hahahha its just part of the demonstration
ericsbuds 1 year ago
Science!!!!!!!!!
BuBBaGump014 1 year ago
Has our galaxy a proper movement relatively to the cosmic microwave background ? And does it matter anyway ?
taraz3d 1 year ago
Thumbs up if you thought this would be about Michel Foucault! ;)
cuntylishus 1 year ago 2
so like water going down a plug hole?
eBsycouk 1 year ago
So if you were dropped on an unknown point on the planet, you could rig up a ghetto Foucault's Pendulum, time how long it takes to do 360 degrees, note what direction it was rotating and work out your latitude, yeah?
ericsandmeyer 1 year ago
There appears to me to be two assumptions made in this experiment. First is that the only forces acting on the pendulum are gravity and friction. (And gravity is itself an assumption.) No other forces are considered. The second assumption is that the gravity vector field doesn't have a curl.
recoveringcultmember 1 year ago
the one at work (radboud university of nijmegen) is driven by a clever magnet setup and during the day you can see the effect which is very cool indeed
MeriaDuck 1 year ago
it's tricky to remember how the earth virtually revolves around you if you imagine you are a foucault pendulum
MeriaDuck 1 year ago
He can't remember which way the Earth rotates? How difficult is it to remember that the sun rises in the east?
oisiaa 1 year ago
@oisiaa This is Roger Bowley, the professor who does not know which way the world spins. So I screwed up --- it's hard to get everything right when improvising for the camera.
MrOldprof 1 year ago
@MrOldprof My deepest apologies sir. I seriously respect your knowledge and absolutely love watching you on Sixty Symbols. It was my error to point out such a simple mistake that anyone could make.
oisiaa 1 year ago
There are no flames allowed in the Antarctic? That has to be the biggest no-smoking zone in the world.
jacksawild 1 year ago
haha, i thought the earth spinned at 1/2km per second? so that would be pretty fast because it has to go all around in 24 hours
loserofnothing 1 year ago
Thanks for undoing some of my misconceptions about this topic:
1 I thought the rotation of the earth would give it a push so that it would keep swinging forever,
2 I thought it took 24 hours everywhere.
Stupid me...
arneperschel 1 year ago
if they made the pendulum outof a denser material (ie: depleted uranium), it would have less air-drag and would swing for longer.
Is it possible to design a more aerodynamic pendulum? perhaps a disc instead of a sphere.
roidroid 1 year ago
Or you could evacuate the area so there is no air resistance just frictional decay which is slower to stop the experiment... TO THE BELL JAR!!!
MarxIzalias 1 year ago
I still remember when I first saw this thing vividly in London Scientific museum. I was shocked. We now could think of many crazy ways of demonstrating the Earth's rotation, but who can imagine someone did this long before space age, in such an elegant way? If I saw this when I was much younger and somehow understood it, I would have become a scientist.
yusukeshinyama 1 year ago
what was the device at 4:38?
i've only ever seen them in science fiction films :P
Daniefab 1 year ago
He totally lost me at the end.
rizzelet 1 year ago
@rizzelet cos you a retard
ignilc 1 year ago
@rizzelet cos you a retard
ignilc 1 year ago
@ignilc Must be
rizzelet 1 year ago
How can the pendulum change direction of swing with respect to ground while its tripod is attached to the ground?
Austyg 1 year ago 2
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@Austyg "How can the pendulum change direction of swing with respect to ground while its tripod is attached to the ground?"
.
Because, ahem, the ground is moving. The whole frame of reference thing is very confusing, well, to me anyway. I believe that in principle someone might try to argue that the Earth is static and everything else moves very strangely around it. But this pendulum shows that the earth is really spinning. It's a bit like holding a pendulum on a kiddies roundabout/carousel.
chrisofnottingham 1 year ago
Austyg, you asked one of the more sensible questions here. key to accuracy of any such pendulum is a free suspension allowing low-friction rotational movement between the mount and the bob cable. some friction remains in any mechanical connection, but it's vastly overpowered by the force of the pendulum. supposedly, the original by foucault had no such suspension, so the cable would torque up with twist. still, it was apparently a negligible error compared to any indication of earth's rotation.
2ndAsstJizzMopper 1 year ago
Would it be possible to cut down the friction of the air in a vacuum to keep the pendulum moving for a longer period of time?
jdunk2145 1 year ago
"pushing the damn thing" heh
MrLegitFlip 1 year ago
4:37 WANT.
techdawg667 1 year ago 2
@techdawg667 yes! anyone know where i could buy one?
zanderzander05 1 year ago
@zanderzander05 Amazon sell them - just search for globes and they have a few magnetically suspended ones.
nolongerlong 1 year ago
What i dont get is this:
When the pendulum is set to start it has the same angular speed as the earth beneath it. And as soon as you start the pendulum this angular speed drops to zero. How?
bliss314159 1 year ago
Comment removed
bliss314159 1 year ago
Now I am wondering what would happen if a hurricane crosses the equator. Would the Coriolis forces cause to the hurricane to become disorganized and dissipate?
rithem412 1 year ago
this demonstration also shows that gravity does not induce torque
ammanRex 1 year ago
For the direction of the tangential velocity you can use a right-hand-grip-rule... if you imagine your thumb is in the same direction as the vector of the connection of the geografical southpole to the geografical northpole your fingers show in the same direction as the tangential velocity of the earth...
pnBonanza 1 year ago
Nice. =)
I imagine one could do the same thing with a gyroscope. Probably easier to keep in motion than a pendulum would be too.
L00NGB00W 1 year ago
Great symbol! *likes*
deadzen 1 year ago
take that geocentrists!
Paxmax 1 year ago
that eart thingy was cool...how does that work?!?!?!
bozy99 1 year ago
@bozy99 Spinning magnets.
deadzen 1 year ago
Could you please explain inertial reference frames please? I mean I understand what an inertial frame of reference is but... why the distant stars? Why is the pendulum stationary with respect to them and not to something else? I have been thinking about this for ages and can't come to a reasonable conclusion. It's as though these stars were special, but I suppose even if you went really close to one of them you would still think about other stars as being distant.
It would make a good video!
eltotoX 1 year ago
@eltotoX Because the stars experience such a small acceleration as they orbit the galaxy, using them as a reference is a very good approximation to an inertial reference frame (non-accelerating, non-rotating). The stars aren't special, they just make a useful reference. Hope that helps.
BGenerous 1 year ago
@eltotoX He talks about stars because to us they appear to be immobile - at least immobile over 24 hours. The only motion the average person can detect from stars is actually the movement of the Earth. Of course in reality they are moving in all different directions also.
culwin 1 year ago
The Earth model was rotating in the wrong direction, oh and the fire trick was interesting :)
nhojmabon 1 year ago
wow, awesome video. got one at uni and very really understood what it was about... cheers
metfan89 1 year ago
I remember one of these things being in an episode of "Lost" :)
Great demonstration and explanation. Cheers!
andyroo24601 1 year ago
I can understand why the pendulum rotates when it is placed along the Earth's axis, but I can't figure out why it rotates when placed at say 45 degrees to a pole.
Kargoneth 1 year ago
@Kargoneth Try to imagine it with Vector Forces, If at the poles the Force acts directly perpendicular on the pendulum making it rotate, and at the equator it acts parallel to the pendulum motion, in between both of them, the force should be on an angle which still causes it to rotate around.
NAMLegolas 1 year ago
@NAMLegolas
That works. Thanks.
Kargoneth 1 year ago
Where the heck do I get a globe like that?
ECbanana4 1 year ago
@ECbanana4
search 'magnetic floating globe'
earthnfyredesign 1 year ago
Wouldn't this be an example of precession?
Uberjoe19 1 year ago
Here is my example:
If you rotate a mug of tea fairly slowly, the top of the tea in the mug stays still while the mug rotates.
G3org3Master 1 year ago
pit stains... dude, i got have right now too. Ha ha.
scottyboyy99 1 year ago
Need a massive bell jar and put the pendulum in a vacuum.
Kargoneth 1 year ago
@Kargoneth nice idea :)
soulvibe2007 1 year ago
Every physicist has their experiment that they get excited about when they hear about it. THIS IS MINE!
How simple an experiment can one person do to explain so much. Greatest showcase of science ever.
525047 1 year ago
E. spin----> counterclockwise
mrblisterfist 1 year ago
@mrblisterfist
Just to be awkward i'll say it depends which hemisphere you're looking down on.
benkettle 1 year ago
@mrblisterfist counterclockwise is used for 2D but what's used for 3D? if the earth rotates counterclockwise from the north pole, it is the opposite direction from the south pole.
G3org3Master 1 year ago
Whoooaaa, that's a very cool globe! Where can I get one?
silentelysium 1 year ago
I've just seen this pendulum being demonstrated by James Burke (connections 3). I totally remember learning about it at school but I'd forgotten that the point of it is that that the pendulum is independent to the rotation of the Earth. Amazing! (when I forget which way the Earth rotates I simply remember that the sun rises in the east... so the Earth rotates towards the east... the other way to this video:D)
McPrfctday 1 year ago
I've just searched through the full text of the antarctic treaty and I can't find any reference to the prohibition of open flames.
I have read Allan Baker's website about the experience/experiment and he does indeed state that it is against the treaty.
Anyone have anymore information about this? Seems strange to forbid the use of fire in this manner when the second article of the treaty supports 'freedom of scientific investigation'.
That is all.
comface 1 year ago
At my university it's not a motor that keeps it going, but rather an electromagnet underneath the bob. Personally I prefer that method :)
MrYfe 1 year ago
I love this channel, I'm feeling a little bit smarter already ><
you disagree?. whatever =P
Kimerats 1 year ago
Does relativity predict this effect?
VanillaShoelace 1 year ago
I'm happy that you made a video on this.
BYMYSYD 1 year ago
Why a motor? Why not just put it in a vacuum jar and eliminate the air resistance?
ereg1300 1 year ago
@ereg1300 for 2 reasons:
(1) you can't create a perfect vacuum
(2) there is still friction in the string of the pendulum, that would - even in a perfect vacuum - eventually couse the pendulum to stop
so a motor is the best solution to this problem ;)
philinator94 1 year ago
I am hung like a Foucault pendulum!
shocks007 1 year ago
@shocks007 lol.
BIGGGY305 1 year ago
Does the toilet swirl opposite in the northern and souther hemisphere?
carlsontechnology 1 year ago
@carlsontechnology yes
xajduk 1 year ago
@xajduk Actually no.
Experiment.
1. Try to predict which way the water should rotate.
2. Look at how one toilet behaves. Make a note of this.
3. Repeat step 2 several times with different toilets.
4. Take a look at your notes. You should find that the water rotates 50% of the time in one direction and 50% in the other. Give or take a bit for random behaviour. 50% chance that your prediction predicts which way the water goes the majority of the time.
You can change sinks for toilets above.
rjhrjh3 1 year ago
Comment removed
physicsbugga 1 year ago
@rjhrjh3 but the reason a toilet drains one way or the other is most often due to the design of the toilet itself. It's designed to encourage the water in one direction or the other..
I would suspect there's not that many designs for toilets and some toilets would be more popular than others and as such you wouldn't get a 50/50 split...
SirMildredPierce 1 year ago
@rjhrjh3 toilets are designed to flow in a certain direction. It is not a fluke that a particular toilet will always flow in the same direction.
physicsbugga 1 year ago
@physicsbugga wind is a factor to include on this myth something of larger scale like a hurricane vortex do they form in different direction depending side of equator they begin ?
okuma0kuma 1 year ago
@okuma0kuma oops i forget to use word quaternion for the word survey
okuma0kuma 1 year ago
@okuma0kuma I don't think so, the effect of the Earth's rotation is very slight (360 degrees in 24 hours). The force of gravity of say the moon is much stronger I'd say - you get tides from that. I'm no expert, but I think that's what the scientists say on the subject. Oh and the centrifugal force produced by the Earth's rotation will also have a greater effect (conversely on the equator and 0 on the poles):
Location Latitude m/s2(gravity acceler.)
Equator 0° 9.7803
North Pole 90° N 9.8322
8DX 1 year ago
@8DX As well as obvious gravity but wind / pressure is a factor on the pool of water surface weather it is high or low i think it is part of coriolis effect isnt it !
quaternion
okuma0kuma 1 year ago
@rjhrjh3 Toilets are designed with the intention of water too rotate, not just enter straight down into the center of the bowl. The nozzles are angled.
tiredfingers99 2 months ago
@carlsontechnology I would say it depends on the toilet not on which hemisphere it's located. A toilet wouldn't swirl at all if it wasn't designed to.
SilkSwe 1 year ago
What's with the advert at the begining of the clip?
Penndennis 1 year ago
How did Foucault keep his pendulum going the whole day to see it rotate?
wpaxton 1 year ago
@thelleht Are you referring to Ibuki Fuuko? ;)
gwaur 1 year ago
@gwaur Hah, Clannad =p
I think I saw something similar but on the cartoon "Jimmy Neutron" haha.
FaintSnow 1 year ago
Yep, you got the Earth rotating backwards :)
Alhoshka 1 year ago
Thumbs up my comment if you want the Globe!
IMakeOrWatchVideos 1 year ago
I'm sorry, but I want a globe like that! (No, i'm not talking about roger's backside)
mvszao 1 year ago
@mvszao You can buy one from amazon for £10, I have one myself its pretty awesome but to keep it running is a waste of energy.
puretroubleman 1 year ago
@puretroubleman How does it works? With magnetics?
mvszao 1 year ago
@mvszao as far as I can tell it uses a 1 magnet in the stand, the top of the globe has some type of metal probably steel or iron and a electric force which i assume flips the fields so quickly that it repels and attracts so that it can not move.
puretroubleman 1 year ago
@puretroubleman Why not have the top of the globe and holder be north poles and the bottoms the south poles?
calvinhobbesliker2 1 year ago
I can visualise why it works at the Poles and not at the Equator but for all the middle latitudes all I can do is a mathematical interpolation. I've never really managed a proper mental image of what is happening.
In a similar but different kind of way, this reminds me of the Coriolis effect.
chrisofnottingham 1 year ago
I like simple experiments that reveal something we can't sense. Nice job :)
P00P0STER0US 1 year ago
Ha I've seen this before, never knew what it was called or who was behind it!
squalea 1 year ago
Brilliant!
canvent 1 year ago
sahweeet
Smeggers08 1 year ago
First!
andersvj 1 year ago