The Controversial Physics of Curling - COLD HARD SCIENCE - Smarter Every Day 111
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- เผยแพร่เมื่อ 25 เม.ย. 2024
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Custom Curling Graphics and Amination Components by:Emily Weddle Design
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Equations coded in LaTex by Will Leahy:
www.willleahy.info/
Curling simulations by: Keith Langsdorf
If you want to try curling in the Milwaukee, Wisconsin area, visit
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Robert Farrell answered my Facebook appeal for Photographers/Videographers in the Milwaukee Wisconsin area and filmed the curlers for me at the Milwaukee curling club.
He's a photographer www.robertfarrellphotography.com/
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With thanks to:
JR Ginex-Orinion - he helped me by putting the equation in LaTex and giving me a file.
Point Mallard Ice complex let me run my curling stone on the ice between free skate and hockey practice. Thanks!
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A Special thanks to the researchers at Uppsala University in Sweden. They study tribology, the science of friction. Check out their work: www.angstrom.uu.se/tribomaterials
Here is the techical paper written by Harald Nyberg from the video:
tic.epfl.ch/files/content/site...
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Destin - วิทยาศาสตร์และเทคโนโลยี
As a Canadian I felt like it was my duty to watch this.
Ryan Pearsall same
Agreed-it's interesting to see how Americans view the game, although recent international success is leading to more exposure south of the border.
I’m American....is there something wrong with me 😱
Ryan Pearsall Same, but as a Swede
**Canadian anthem intensifies**
1:13 - I got an urge to tell him "don't you dare scratch that coffee table with that rock!"
Ok mom
Ok mom
Ok mom
Don't scratch the rock with the coffee table
Same
Wait a minute, so does that mean that whoever invented the curling sport knew of the physics occurring during the stone's travel and the sweeping, or does that mean that explaining the physics occurring is an afterthought and sweeping the stone's path was just a thing to do for fun?
The Scots invented Curling. I'm guessing it was invented, as many sports are, as a social event involving drinking, competition, and camaraderie. How did brooms get on the ice? Women. Why? Speculation. Once the brooms were left on the ice the boys were left up to experimentation and observation with those brooms. Thank women for Curling. Without the brooms they left on the ice, Curling would have never evolved into the sport it is today.
Edit: Add: Yeah, physics has nothing to do with Curling
@@peterbills4129 Thank women for something men did, great
@@The_Arctic_Kiwi So I was trying to make a joke, but I guess I was too subtle. My apologies.
Yes, horse hair is used in curling brooms today. At the time curling was being developed and refined they used old fashioned brooms. Ones that look like what witches fly around on. Evidence of this can be found in the emblems of many curling clubs and pins awarded at bonspiels. The club my parents were members of literally had old brooms of this type hanging on the walls.
What I was suggesting was the women, angry that their men were spending too much time having fun and drinking it up while curling, went down to the river or lake with brooms to chase their men home. If you search for "woman chases man with broom" and look at images, you will see what I'm getting at. It's a relic "meme" of the past.
It's not that strange, lots of sports and activities have complex physics at work. A lot of advances predates understanding the physics that underpins them. People who do something over and over tend to experiment, or do things by mistake. You don't need the full scientific method to start to figure out what works and what doesn't work. After generations of ad hoc experimentation the best way to do something can end up being counterintuitive, like how to curl a stone.
And as to why people are interested, that's the wonderful and infuriating truth about science. No one knows what is going to turn out to be an important discovery. If it's a profession then understanding the underpinning science can lead to faster breakthroughs. Those breakthroughs mean cash. If I figured out a better way to curl a stone you better believe I'm going to open my own curling business.
But again, since science, figuring this out might have massive reprecussions. This is ice and friction. Maybe whoever cracks this will mean others applying what they've learnt to new areas. It might make the lives of people in cold climates safer or could change how we deal with friction in everyday life. Or it could just help Canada or Sweden in a bonspiel.
Peter Bills very rarely are horse hair brooms used anymore. In fact, I would be really surprised if anyone was using them for other than sliding. Covered brushes are used now, and they don’t leave any debris on the ice for rocks to pick. My skip still uses the rink rat for sweeping!
2:35 Just watching that makes me want to cry. I can feel the pain in my knee
4:25
I thought friction doesn't depend on the surface area of the contact.
Totally. Im a hockey player and I can tell you - that was a bad way to fall. He was hurting more than he let on.
The laugh this fall produced is amazing though
As a hockey player I know how that hurts even with all my hockey gear on
Curling stones are little UFOs with little aliens inside steering them.
+Ryden Swalwell ayy lmao
+Ryden Swalwell The men in black will soon erase this comment and your memories.
+TiegonBerry so proof that this is false is the comment is still there and we can remember it. we should us this method to test all conspiracies
joe scrib
the govt has known this for years and
is still spending millions covering it up
ben williams, that would mean nothing is true at all.
I think its so cool that we've got a relatively simple sport (in concept, Im sure there's a million aspects to the game) thats been played for many many years and people are still debating over how the physics of a curling stone works. Something that appears simple on the surface, but theres a heck of alot more going on when you dig deeper. Gotta love science!
@@getonthecrossanddontlookba5004 k
@@getonthecrossanddontlookba5004 - I think you'd find Richard Dawkins work right up your street.
1:24 I immediately felt my wife yelling at me for one of my friends scratching the table
The game has advanced immensely since 2014. There are so many variables to consider. The advances in broom design and ice preparation are big. Sweeping technique and the fitness levels of the sweepers are huge factors. For the average club curler it doesn't matter, just go out and have fun. Next to golf, curling can be the most frustrating game there is. But then, you make a double take out and it's all fun again.
Curling is what happens when you live near the Arctic Circle, it's February, you haven't seen the sun in months, and you need to invent a way to pass the time before you go completely out of your mind. You go out to the toolshed and there, you find a rock and a broom, and g/d it, you are GOING to make a sport out of them.
We can only thank our lucky stars that the inventor of curling didn't find a dead moose and a carton of gunpowder in the toolshed, or else "curling" would be a significantly gorier sport.
Your comment made me laugh pretty hard, so thanks for that.
There is a sport in central asia which involves people riding on horses while attempting to put a goat carcass in a goal.
Janis Cortese. HA! I curl and that made me laugh so hard.
little did he know that only 1 year later, subbable would be acquired by patreon.
And that Patreon would start getting trigger happy banning content creators it doesnt like
@@arklowrockz Just lile ye Old tube
So that's why I have never heard of them anymore
what?
that's a shame. we need another platform that doesn't cater to the cancel crybabies and that somehow doesn't get overridden with deplorables either.
Canadian here. Curling was my high school sport, so I find this topic fascinating. I remember we would find that a slow rotation worked much better than a fast rotation. In fact, if you wanted to ensure a straight throw (in practice only, you’d never rely on this in competition) you could spin the stone really quickly. To me, this lends credence to the theory of the differential speed of advancement melting the ice more on the left (for in-turn or right for out-turn) edge of the running band. When you spin the stone so quickly, the extra rotation overwhelmed any advantage created by the differential so the frictional lateral forces were negligible. (I think that makes sense, right?) Anyway, not sure why it took me 8 years to watch this video, but thanks!
canadian here = reliable source
Does this have anything to do with the direction the water spins in the 🚽
AYE?
@@ludicrous7044 no
2:35
Should have used his Phantom camera for that one
Press F to pay respects.....
I'm here for the laugh in slow mo
This is all science friction to me. ;p
I’m guessing you saw the pun on the Seeker video in the recommended section literally an inch from this video ;p
Key & Peele - High On Potenuse
Puns are super effective against me.
The ending was a bit of a drag,
lol
We know how to fly and land rockets on mars, but we still don't understand how a simple curling game works.
Waaaat
we still don't know how cats purr......
A cat's purr begins in its brain. A repetitive neural oscillator sends messages to the laryngeal muscles, causing them to twitch at a rate of 25 to 150 vibrations per second. This causes the vocal cords to separate when the cat inhales and exhales, producing a purr. But not all cats can purr.
Cats can also mimic the decibel of sound given off by other creatures with their meow and purr. For instance when cats interact with humans they tend to give off the same frequencies as human infants. Curious.
Before we can understand how a simple curling game works, we have to understand the reason that curling even exists as a thing in the first place.
when have we landed a rocket on mars🤔
Destin, I watched this video years ago when it came out. I've just watched it again, and I'm sat here wondering if you might be able to learn more by creating an experiment with a high speed camera, shooting from underneath, recording the interactions between a curling stone on a sheet of polyurethane which has been prepared with a thin coating of pebbled ice. It'd be incredibly cool to even find out if you could see any friction melting happening through the lens. Just a thought.
Or an optically clear curling stone
But there must be ice on the top of the polyurethane to make the "curling rock" slice, and that would disturb the video...
(Am I saying something stupid? Yeah, probably I am...)
@@markszyszkiewicz hi mark they make small rocks for kids out of cement that weigh 18 pounds and 25 pounds and they don't curl the same as a granite rock . so i think it would be unlikely that your idea would work. there is come chemistry in affect with the special granite from Elsa Craig island in Scotland where all currant curling stones are quarried.
@@mikemoloney6448 maybe it uses Earths magnetic field as well))))
This reminds me a bit of the physics for the aerobie, where the trailing edge “spoils” the leading edge and we get a different response then expected. Loved this. Even showed it to my aunt in her small hometown in Saskatchewan where they have a curling rink.
I love your videos. You educate without talking to us in a condescending manner.
Skie Mendacium Makes you wonder why they can't do the same thing in schools.
Sean Bevan Passion.And he gets to choose what he makes his videos on, teachers are more or less forced to teach to a certain curriculum and they don't really have a say in what they teach about their subject.
That would make me lose a drive for teaching.
Jack Florence Bingo. I agree that its a passion for what you do. He doesn't see these videos as a "Job". There are teachers out there that have that passion and attitude that do an AMAZING job. Sadly, it seems they are more the exception than the rule, in really any profession. Think of what the world could REALLY be like if EVERYONE was more passionate about what they did. Would be pretty amazing!
Todd Wright Oh yeah, I had a few teachers who were so excited to be teaching what they had that day, and they were the ones I learned the most from, but they are few and far between.
"Interesting facts" and education are two different things.
When I began curling 12 years ago (I'm only 20 so it's been a big part of my life), I originally thought it was the same thing as the guy from BC said. I'm also Canadian, so maybe that's just how we think. The scratch theory that the Swedish man talked about is what we used for so-called Directional Sweeping. If a sweeper starts their broom in front of the centre of the rock and sweeps on a slight angle towards the other side of the rock, they will create scratches on the ice like the Swedish experiment with the sandpaper. This will cause the rock to tend towards that direction. Before 2010, sweeping was mainly to make the rock go further, and also to make it curl less. Now, when I say curl less, there's an important distinction to be made. The rock is not actually curling less. If you throw two rocks 100% exactly the same, one swept and one not, the two rocks will line up perfectly, just one past the other. The rock doesn't curl less, but more it delays its "breaking point" when it really starts to curl, due to it not losing as much speed because of the sweeping. Before the 2010 Vancouver Olympics, we in Canada did a study on sweeping and figured out all this stuff about directional sweeping, but it wasn't really used. In 2013 and 2014, we had what would later be called the "Broom-ha-ha." Horsehair brooms, as can be seen at 4:22 with the guy on the right in the video, are extremely efficient at this directional sweeping, because the individual hairs scratch the ice a ton, and therefore make the rock move a ton. An interesting video on it can be found here: th-cam.com/video/haEuz42YCdM/w-d-xo.html The scratches in the ice make the rock tend towards a direction, but I don't think the rock causes the scratches enough to make it curl. I believe that it's the difference in velocities on the sides of the running band that cause it to curl.
flashback to the ridiculous (now illegal) broom with the waterproof coating and plastic insert that can literally change a rocks direction
As I watched this video, I kept thinking these stones curl the same as a spinning baseball. Maybe the mechanism of the curve/curl has more than just a superficial parallel. If they are deeply equivalent, then the differential speed of the advancing side over the retreating/more slowly advancing side would be the cause on both cases. ... In baseball, the advancing side builds up more pressure on that side of the ball and pushes it the opposite way (the ball curves toward the way the front of the ball is spinning). The effect is more pronounced with a textured surface (the seams on a baseball and the dimples on a golf ball). So, if my hypothesized parallel is true, then, by moving faster over the ice, the "advancing" side of these stones would be pressing down on the same spot on the ice for less time thereby causing less melting there. There would be more resistance to forward motion there. ... Is that it? Or does that not duplicate the equivalent of air pressure in this thought experiment?
as i watched this video i imagined people would come up with crazy lies like your story
Greg Conquest. I believe the baseball curves due to lowered pressure rather than increased pressure. According to Bernoulli principle when air speed increases, pressure must decrease
Otherwise interesting theory !
Too long
I've very much enjoyed this series and I love it when questions are hanging in the air!
This is the ultimate its 3am and I haven't started my essay yet video...
It's comforting to know the experts aren't sure.
seems ridiculous that musk has rockets landing on there toes from orbit yet we cant explain how curing works
2 things no one ever thought would be mentioned in Alabama. Curling and physics.
Physics is mentioned a lot in AL. NASA has facilities there. Curling? Yeah. I'm surprised anyone in the South knows it exists.
Oh I know brotha I wasn't trolling. Just failing at humor.
+Vernon Huffman Your last reply is my entire life lmao
We know you were talking about the general population lol.
I’m no one
3:04
Me: "where are you going"
Cat: "YES"
I love all your video Destin! I'll be contributing! So much love for this channel.
Curling looks so boring but its actually really fun.
And as Destin found out, a bit harder to throw aswell :P
that's what I always say.
The hardest thing about curling is the ice.
It's boring for me if it's not close.. or a shut out..but I do appreciate the skill involved in curling
Throwing is not hard if you have a broom.
@@currentbatches6205 honestly i think the hardest thing in curling is the granite stone
I love how the people who invented the sport most likely didn't understand a fraction of these explanations of the strategies they developed just by playing the game.
If you go into enough depth into anything you get to the point where nobody understands it. Luckily, the laws of physics don't have to be understood to tune a neural net to respond in the correct way to a set of inputs, so nature simply sidestepped the problem and got on with it until humans showed up and started asking questions :-D.
All kinds of people drive cars but most of the don’t understand internal combustion engine.
@@OmGoit What? I have two cars, and neither one has an internal combustion engine. Ohmmmmmmm
@@johnglennie4282 Power Wheels arent cars.
The graphics on these videos are always so well done and easy to understand truly quality content
Love your work. Keep it up. I’ve seen every video you have made and always anticipate new arrivals. Thank you for the knowledge
3:06
Cup: teachers knowledge
Cat: me
I started playing curling a few weeks ago, thank you for these videos. As a former student of Physics, I appreciate them so much.
so hot
As a Canadian Curling fan I am serious in saying that I appreciate all the hard work and research that went into this. Kudos. +1 for mentioning UNBC.
Go UBC!!!
In addition to all that is outlined here, brush head materials etc also play a big role. In more recent years, there is even directional sweeping being used. It used to be thought that sweeping simply increased distance while lessening curl and visa versa, but it turns out the direction the sweeper closest to the stone is "pushing" while sweeping can also increase or decrease curl, even while simultaneously increasing distance.
3:06
Cup: teachers knowledge
Cat: me
Lol
You're a very smart man! Love your channel and your content! The true way to continue growing as a being is through education!
I propose that the competing labs face off in a science curling battle to decide whose idea will emerge victorious. Two theories enter, one theory leaves, everyone has a beer.
Great stuff SmarterEveryDay
I'm for the 2nd (and obviously superior Canadian theory) with the different frictions due to different forward and reverse velocities of the spinning rock. That's the way they explained it on Murdoch Mysteries so it must be correct.
Excellent video, as someone who loves physics and grew up next to canada I salute you and your hard work
watching you fall on ice was the funniest thing ive watched in awhile...and love that you had fun during lmao
I watched curling for a few hours today and I must say I found it very boring.
Plus the women kept giving me funny looks through the hairdressers window.
My Stoner Mind what, you watch these videos
My Stoner Mind jjjjmkmo
very clevar
Hahah! Oh my aching sides! 👍🙂
Hahaha... dude... thanks for the laugh!!
Destin, I wanted to highlight a misconception about the purpose of sweeping in your explanation: sweeping early does help a rock run straighter, but sweeping late does more to extend the path of a rock and actually extend any potential curling of a rock. Rocks curl when they move slow enough with respect to the ice (conditions effect what speeds they curl at). In the end, you will see a skip call sweep for weight (velocity shortfall) and line (target accuracy) at different times and with different goals.
@2:02 i thought you were about to launch that cup across the room😂
yeet
Destin, I just ran across this old video... I'm an ice hockey player, but I got invited to play in a curling league for a year or so and won a number of championship games while doing so. It's a very complicated sport and we luckily had one of the best strategic skips leading our team. I enjoy engineering and physics and that's really what made me want to try this sport out.
I never thought I would watch a 10 minute long video about curling and actually be entertained! great video! :)
Excellent! Both the topic selection AND video.
Love you brother! Thank you for your videos from 2021
Wow! What a video. As an avid and competitive curler I found this very interesting. It turns out that the "scratch theory" regarding the rocks curl is more correct. Nowadays we use "directional sweeping" to control how much or little a rock can curl. We do this by sweeping on a certain side of the rock and scratching a path with the broom allowing for more or less curl.
Be my science Teacher please.
he reaching out to more people this way tho
An actual teaching would be much less entertaining that those videos, unfortunately. If you really want to have a useful deep understanding of the mechanics of things, you can't escape the math. And math is hard.
math is hard, but if you look at it like a challenge, you will -still- considering them entertaining.
Nuxxy
Destin's master class?
A curling controversy! I love it!
I really like curling, it's chess-like strategy, remarkable precision and funny calls.
I really had no idea that there was so much scientific mystery to the curl.
Awesome!
I was pretty sure the stone curls because it's heavy enough that the circular edge on the bottom cuts into the ice, and that creates tracks in the ice that the stone follows (as much as the forward momentum will allow). But a cup on a wooden table doesn't exactly follow those same rules.
In fact, a glass or a cup on a table exhibits exactly the opposite effect,
My goodness, I learned a lot here, thank you for your explanations and humor. 👍👍👍
I love your channel but as a woodworker, 1:25 made me cringe
The cat said the same thing at 3:02. The cat was like..."F@#$ that, I'm out"
lol I'm not a woodworker but I was also like "is he really doing that to the table?"
I'm just careful with my suff, and I was like: "you're gonna scratch the table!"
Who cares? A table gets scratches at some point no matter what anyways. Even more so considering he has a cat.
Sam Chaney him on ice made me cringe
Patreon is also monthly - keep up the great videos. I work 120 hours a week and have limited time for youtube and you are one of the few I always watch!
Maroonedinred sounds about right 5 to 6 hours sleep a night. How? No clue and that scares me even more than the workload.
Nerys what do you do that takes up such time commitment?!
TheTransforcer three full-time jobs trying to take care of my pups family in the dead he left me when he died :-) yeah it's fun
I hope you enjoy working, You'd never catch me doing 120 hours at "work" to give myself the life I require..... I don't undersell myself, maybe you don't either but live in a system that leaves you with no option to do so. GET OUT! The world is a big place and there are opportunities everywhere, you just have to willing to put yourself first.
i hate it. but I have few choices. again if it was just me I would have been out a year ago. but its not just me. I have siblings I am morally responsible for to at least some degree. My sister in particular is mentally retarded. while functional she would not survive on her own at all. these responsibilities complicate things greatly and have me kind of "stuck"
if I can manage to get a mortgage to secure a new home then options open up for me. I can sell this house erase all my debt and have a chance at a fresh start in a location with a cost of living about 1/10th what it costs to live here.
A lot has changed in the curling world in 7 years. (Even at the club level, but especially at the pro level) This video deserves a follow up video!
Agree. The various ways that directional sweeping are done and how angles of sweeping are changed depending on speed and rotation is cutting edge science
I'm so glad you covered this. I was actually excited when I saw the thumbnail: "Oh! Destin's done a video on curling!" But it's interesting you talk about the leading and trailing edges; I always thought it was about differences in the left and right sides. Like a helicopter rotor (you have a video on that) when it's moving (translating?) one side is moving through the air faster than the other. I know a Frisbee does this, and it's responsible for why Ultimate players release a forehand throw with the disc tilted down -- if they don't it will flip itself over. You need to do a companion video on the physics of Frisbees! The difference between the glass on the coffee table, and the stone on the ice sheet is something to do with weight and melting. Ice skates work by concentrating weight onto a blade edge, such that the pressure is so great the icy actually melts. Does the stone do this? More exploration required...
Is that lack of downward turn why my flick is so bad?
@Joshua Tree Maybe, but probably not.
A disk that is thrown with no wind, completely flat, with the right handed backhand, it will eventually fade to the left, from the thrower's perspective.
If the disk doesn't have enough spin, it's not stable. Try to give it more wrist flick and imagine your disk is running across a table as you're throwing. (This is just a guess, having not seen you throw 😄)
Good luck!
Source: 10 years of Ultimate and disc golf 😁
Canada dominates curling with 35 golds to 7 for Sweden.
canada ftw
Mexico rules with our Curling captain Consuela; no no no no!
Mexicos second best player is Carlos Juan Martinez lopes Rodrigues of Guadalupe.
He's also Donald trumps butler/slave. His second favorite sport is cross country.
Elvineagle what does trump have to do with curling?
@@snaglinegaming6097
Nothing, thank God
10:00 "i just broke it, dont tell on me", momma is always in charge 😂😂😂
Great video ive been wondering hoe these curling works thanks for clarifying it to me
This work is a great contribution on the way to a wonderful solution to a non-problem that is not worth solving.
Wow, I had no idea there was so much technicality behind this seemingly simple sport.
Curling is the opposite of simple...
It's the hardest sport I've ever tried. Don't underestimate curling until you try it.
There is a reason why they call curling "chess on ice". It is anything but simple.
Cool video. I always imagined the curl had to do with asymetric friction melting, so it's interesting to see the other theories.
For the curling haters out there, one could say the same "It's boring" comment to any other sport out there when you haven't tried it and you don't understand it. An experience is never at the mercy of an argument.
Great content as always! The handle moment of inertia can play some part in this can it ?
I would love to see a Smarter Every Day video breaking down the science of billiards, how english is applied to get the cue ball to curve during a shot, jump shots, bank shots, etc...
I know from experience of how many different factors are involved with it. It just seems like it could be an interesting video👍
Hmm. Scratched table, scratched floor, broken drinking glass... your wife made you mention the patreon vs Subbable thing, right? :)
the same thing happens with footballers when they impart spin. look at the roberto carlos free kick of 1997.
Though balls in the air clearly don't have friction with a solid surface. And balls rotating on a solid surface have 3 dimension of rotation, which would probably factor into a lot.
guppo26
Its essentially the same thing but with air friction. As the ball flies through the air with a spin, it pushes on the air with a greater force on the side that is spinning forward than the side that is spinning backwards. This creates a high pressure area on one side of the ball that pushes it to the opposite side.
It's a completely different mechanism, no comparison..
Derek Corbett in both cases, intuition is wrong because of emergent physical phenomena. absolutely a comparison.
John Smith You're right. That's known as Magnas effect, Veritasium has made a video in this, you can find it. However, I think the mechanism in this case is very different.
Destin, I'm no scientist. I'm a truck driver, so I work with what I know.
I awoke this morning thinking about this. Which is kind of strange in itself.
#1: The sweepers heat up the ice in front of the stone to create a layer of water.
(So if a vehicle is driving along and hits some water it starts hydroplaning. Almost no friction on the front tires now and most of the friction on the back tires)
#2: So the spinning would be the reverse of your glass cup example because most of the friction is now on the back instead of the front.
If they stop sweeping then the stone slows it's spin and curving?
So the theory with the scratches doesn't make sense when the water gets involved. The water negates most, if not all, of the friction on the front.
Am I way off base here?
I was thinking the same thing and think you're mostly spot on. The sweepers aren't needed, though, to create the initial ice heat--not for the physics of the spin, anyway; that's provided by the weight pressure and friction heat of the stone itself. The sweepers simply "season" the ice a little so the stone can go further.
Not sure why this is such a big mystery. :D
This is way more fascinating than I ever thought it would be, wow!
And this all started when I made Destin's chicken camera video popular on Digg quite a few years ago.
Did you try rotating the glass on ice? Could be interesting to see if it responds the same way as the curling stone.
Could also be interesting to try the *stone* on other rough surfaces. Textured drywall, pressboard, what have you.
2:41 that laugh xD Made my day! sweet video!
When I was in college the '06 Olympics inspired us to go curling in the dorm hallways. We, too, used glasses... stolen from the dining hall and shattering every time they collided. Brooms were employed to steer the glasses, though this didn't work (they were more useful for cleaning up broken glass). Great memory...
Leave it to the Scottish to invent a game that cant be explained by science....yet.
Could have mentioned that until recent years ALL of the curling stones in the UK came from the Ailsa Craig in Scotland - due to it being considered the perfect granite.
I love curling, thanks for making this video
My fav sport when I am at the pub. It's so calming. And up here in Canada, we have a lot of those on TV.
3:02 Looks like your cat doesn't like physics
Both models require some small amount of ice melting. How would the motion of the stone change if you cooled the ice much colder than normal, and cooled the stone to a very low temperature as well? A temperature low enough to eliminate melt. This might shed light on which theory is more correct.
Commenting at the beginning of the video, I think I might have an idea! The weight of the stone will cause pressure on the ice which will slightly melt it, reducing the friction on the side with the greatest pressure. It's like what happens with skis. The motion is kind of the opposite of what you would expect.
I feel like the secondary explanation makes more sense to me, the one at 6:55 or 7:23 more accurately, it reminds me of the helicopter speed limit...differential lift based on movement relative to the overall motion.
Thr overlapping scratch theory had me thinking it would curl in the opposite direction than it does.
My question is why it also works on the cup on the dry surface of his table
There is a Canadian curler who figured out that by sweeping a certain way you can not only make the rock have less curl but can make the stone have more curl as well. This is called directional sweeping.
not just one you idiot
There is a lot more to this sport than I thought lol. I wanna learn it now
Having just won a gold and sliver at this at the Winter Olympics this was a good watch, 🇬🇧 The effect is a similar result when motorcycling and have to counter steer, ie push one grip away to turn that way, push left the bike will lean and turn left.
@ 3:04 The cat thought ohhh he's again gone mad. 🤣🤣🤣🤣🤣
Good information but probably useless to me unless I find myself in a life or death situation where my only option to live would be to answer a random question about the physics of Curling.
The beauty of science is learning about how things work and turning mysteries into progress. It may not be useful for you but that's not the point. There are people trying to figure this out, and Destin wanted to make this research accessible to us. Which is Fantastic!
I want to listen to Destin's slowmo laugh on repeat forever
Was watching the Winter Olympics in 2022 and saw curling and was so interested in how it worked and here I find this video!
I have always LOVED Curling! So awesome!
I would think that angular momentum would have some impact on the direction of each object, no? The glass spins very quickly, relative to its diameter. The stone, however, has a contact surface much smaller in diameter than the diameter of the object and it is spinning much, much slower. Sometimes not even one full rotation before it stops.
So, then, wouldn't the forward momentum overpower the angular momentum's effect? If forward momentum is not perfectly straight, than as it overpowers the effect of angular momentum it will move in the direction the stone was pushed, regardless of spin.
Notice with the glass that it doesn't really start to curve off course until its forward momentum slows, while the angular momentum stays fairly constant. It isn't until its forward momentum is less than the effect of the rotation that it begins to move off course. I theorize that it moves opposite of the spin because the angular momentum overpowers the forward momentum.
As for the curling stone, forward momentum is maintained all the way through and appears to always be greater than its angular momentum, even right before it stops.
I'm curious to see what would happen if you spun that stone as fast as you could while pushing it forward relatively slowly. Perhaps then the angular momentum would overpower the forward momentum and we'd see it move just like the glass does due to friction at the front being greater than at the rear.
+Chris Snyder I'm quite late to the conversation, but as a long time curler I would like to add a few observations. Spinning the stone faster (thus increasing your angular momentum) actually causes the stone to curl less. For maximum curl you usually want to deliver the stone such that it completes around 2 turns before it comes to rest. Actually it seems that the slower it spins the more it curls, but if there are any defects in the ice you're delivering the stone on it can reverse direction/curl if you don't impart enough spin. That's why people like to stick with the 2 turn rule of thumb. Throwing a stone without any spin can make it behave like a knuckle ball, and more frequent than not it'll "piick up" a spin and curl that direction.
Put something colder than the ice on the ice and see if that affects the rotation?
That is a clever idea. I wonder if you put a stone in liquid nitrogen until it equalized if this would behave differently. My gut feel is that it would just freeze to the ice though!
That's a very good point. I suppose I didn't consider that.
Ice is slippery because of the 'aquaplaning' of the melting ice. If you throw a stone which is colder than the ice, it would freeze to the ice much quicker and the effects would be even less notable.
The rocks are left on the ice 24/7 so they are equal temperatures, though Destin’s rock was likely warmer when he pushed it on the hockey rink. It’s actually a problem to get new rocks onto ice as they need to be left in the same conditions as the ice but not on it because they will melt it until the equalize. The ice is kept near 28°F so that friction melting can occur, ice that is colder does not play as reliably.
That's smart. You can make ice from salty water instead (add some ions) that would decrease it's melting point and affect its specific heat (heat capacity)
I love the reference at the end. Amen!
Meaty, delightful, head-scratchingly curious, artfully edited, and the highest and best use of TH-cam. Destin is Topmost Superior.
I think the Canadian's theory is closer to what I had always assumed. I thought the side of the stone rotating back toward the launch point had more frictional "grab" by virtue of it moving slower relative to the ice under it.
You can often see something similar when a stone comes to rest. One point on the stone will reach 0 speed and stone will pivot about that point. That point has maximum friction. Yes, that thin layer of lubricating water refreezes that fast. So without the lubricatiing layer at that small point, there is enough friction to spin the entire rock, much like a death spiral in figure skating.
Also, as a rock slows, it curls more. I think that supports the Canadian theory a little better than the Swedish.
I feel like the Canadian theory also better reflects that stones take some time coming down the ice before they start to "catch".
Curling is amazingly fun and I recommend everyone to try it! Go Canada !
@2:02 i thought you were about to launch that cup across the room😂
Oh look! The TH-cam algorithm is recommended this Smarter Everyday video that suddenly becomes relevant every four years!
I went to college in Duluth, MN - home of most of the recent US Olympic teams; when wandering around the DECC (the convention center, and where the UMD hockey team played back then), it was always fascinating to come upon the curling club area. The hallway has windows looking down into the rink to your side and down a floor or two - there is at least one small hockey rink there, but also a whole series of curling (lanes?). It was fascinating to watch the sweepers - much more than the thrower. :P I'm probably using wrong terminology, but I say it was fun to watch - I never have played it.
This is curling country though - several wedding receptions I attended over the years near St Cloud were at curling clubs - one time the ice was gone and the rough floor was used as-is... with markings still in place, despite the festive activities going on. That was surreal. Luckily they didn't serve any lutefisk. :D
Now we know the closest Curling club to Alabama, turns out its just over in Wisconsin.
I was convinced that they spin the stone to make it go STRAIGHT like a bullet leaving a rifled barrel. Apparently I'm wrong but not so fast! Would it be fair to say that a stone with no spin would have an unpredictable path while spinning it creates a predictable path albeit curved??
Yes, that is correct.
Always wanted to understand this much more intricate sport. Thanks!
This is the first time I've actually watched right to the last second. Ps 111:2 is the perfect verse for you. Love it!
10:03 blew my mind O.o
yeah same here
That was a wollop, to be certain. I actually laughed out loud at it, because it was so awesome and made so much sense.
Mee Too
what about it
People always say curling is boring but they've never tried it! It's really fun and insanely friendly and social
Insanly friendly? What?
Im guessing youve never curled before :P
yeah, is it fun?
Quentin Jankosky It's really fun and extremely hard.
I don't think people are saying it's boring to play. I think people are saying it's boring to watch, kinda like baseball. haha
Here I thought I never wanted to know anything about curling. Thank you Dustin
I was watching curling the other night for hours and couldn't figure it out, thx for explaining.