hey it's me Destin welcome back to smarter every day so in the Olympics the most athletic team always wins right no it's actually more complicated than that because there's physical objects in the Olympics now the team that is able to manipulate these physical objects better than the other team usually wins for example curling this curling stone is very heavy and if you can figure out how to manipulate it across the ice better than the other team you will win so physics is a huge deal and a knowledge of physics is very important so today on smarter every day we're going to start a three-part series on equipment used in the Olympics and how it interacts with the world around it today we're going to focus on ice skates there are three major types of ice skates used in the Olympics the figure skate the hockey skate and the speed skate this is my new friend Glen he's a bigger skating coach it's really awesome so everyone already knows the angular momentum trick right so large moment of inertia bringing it in small moment of inertia that's pretty awesome so show me your skates what makes you be able to do that because I mean I would mess up because of the toe pick so where are you actually rotating I'm actually spinning backwards my blade is spinning backwards and I'm spinning on a small area we call the ball of the foot also my bottom toe pick is touching the ice so it's allowing me to put forward pressure down without sliding forward like I would on a hockey skate so that's how you're able to keep from falling backwards right yeah I'm not really getting it he's saying he's rotating about this point but he's dragging that toothpick clearly this is a good excuse to break out the fan okay now this is making sense you see I used to think that they pivoted on one spot under the ball of the foot looks like I was wrong they're actually skating backwards and he's dragging that toe pick to maintain his balance that's pretty cool all right it's time to move on to jumps okay Glenn's going to show us three of the main jumps the bigger skinny here's the waltz jump the South cow and the flip there's a gouge where you left the ice might open push off the toe pick and then there's another gouge landed on might open ah can I go down to my blade so I'm pushing off the eye and I'm landing with the toe pick with my toe hitting first and then my blade okay cleanse gonna do a jump and he's gonna land with his toe kick which is how they always land it adds stability it's in the landing of these jumps when the design of the figure skates really start to show you can spike yourself down into the ice with a toe pick and then you slowly rock the blade down in fact the curvature of the bottom of the blade is called the rocker after it's planted firmly on the ground you'll notice it doesn't immediately move away the skater imparts the momentum from his opposite leg back into his lower foot in many moves so it's a three-step process spiked plant move interesting but a question I have is that if the bottom is rounded how do you sharpen a round blade so this seems like a good opportunity to move from the figure skate to the hockey skate so let's meet my friend Nick who's the director of hockey operations at UAH so you're going to show me I'm sorry second time yeah sorry dudes tell me the blade how does it work so the blades here if you look it's two separate I just felt drawn up here okay blade actually so this is a cross-section looks like that no way a lot of people think it looks like that but it's actually there's a hollow in here really yep can we see the sharpener yeah I like the named blade master this is the wheel which actually sharpens escape how do you hold the blade up there is this a sled or something slider everybody's got their own little nickname for it okay and so then if the wheel returning you would bring that in there let me focus okay I can see that curvature that you're talking about can you go closer if you would to the wheel so that's the radius of a skate 33 days 1/2 5/8 I'm not sure I understand you're saying you're saying this hollow right here that some of them will look like that someone was like that so more like that this is completely eye-opening to me I had no idea that ice skates had two different working edges so why would a player prefer a deeper hollow versus a shallower one well think about it if you have a shallow hollow you're able to sit on top of the ice and glide very easily so this is very good for speed but if you have a deep hollow your points are gonna cut down into the ice and plow so you'll go a lot slower however you'll get much better grip and if there's one thing a hockey player needs it's good grip have you ever seen him stop and change directions so I asked a couple of hockey players to show me how this double edge is used to stop on Highness behold the awesomeness of physics that crazy look at what he's doing he's controlling that edge and scratching the top layer of ice off but he's doing it in such a way that it's converting that shear energy into power which he's using to decelerate some people want to believe that hockey players are just dumb brutes but I'm not buying it I told this player I wanted him to stop on a very specific spot on the height so I can zoom in with a phantom and catch the ice spray and he did it on the very first try can you imagine the math that's going on in his brain in order to automate this feedback loop he's constantly sensing his deceleration and somehow his brains converting that information to signals to control the angle of his skates and better the exact amount of ice that he's shearing off to complicate matters he's got ice in between him and his target and he has to anticipate they told about an impulse left in that ice so he can stop exactly where he wants to let's ask him to see if he can explain exactly what he's doing because I'm pretty sure hockey players are physics geniuses he ain't gotta take a glove off man Ben thank you very much do you have any like if you had to say anything about that hockey stuff how exactly do you do are you are you just trying to find the balance so you want to find the inside edge you're trying to find that edge on the ice and just a fine so like a noob somebody's just learning how to do that with a dagger across the ice yes did you just hit that puck without looking he just hit a puck and you hit it without looking yep I'm right there geniuses so if we want grip for a hockey blade we don't want it for a speed skate right which might explain why speed skaters are always falling this was counterintuitive to me but the bottom of a speed skate isn't pointy it's actually a flat sharp 90 degree angle to see speed skaters in action let's go to the Pettit National Ice Center in Milwaukee and check out the US Junior long track championships okay look at how the skater starts off the line you see that open stance they do this because ice skate friction is asymmetrical they glide easily going forward but they dig in on the sides so to propel themselves skaters have to push off the sides of the blade the larger this angle alpha is the harder they can push that's why they line up with their foot at almost a 90 degree angle to the direction of skate speed skates are flat which means each individual stride has to be perfectly level when the foot hits the ice this can be a problem because when you extend your ankle the blade tries to come up off the ice the solution to this is called a clap skate clap skates allow a long track skater to keep their blade on the ice longer into the stride I'll let Adam explain the clap starts to come out I see pictures here just gonna be wise back like that and so that extra push that makes the flap if you contacts on the ice and you can get a lot more power I'll just talk about ice-skating and we didn't even explain why it's slippery in the first place so there's this thing called friction melting if you're moving something along ice it creates this really thin layer of water think like nanometers thick that is why you can slip on ice so easily the coefficient of friction can be defined by this equation it's very interesting okay couple more things you might be interested in number one we've been making infographics and all these winter sports you can go download those and share them with whoever you like also I'd like to thank the sponsor those may do crazy things like try to explain sports I don't really understand so that's all you can support smarter every day by going to audible.com/smarter to get a free audiobook whatever you i've got thousands of titles i used an audible before they ask to be a sponsor for smarter every day so i'm more than happy to suggest that view audible.com slash smarter smarter every day will get credit and that'll help us move towards crazy stuff like this speaking of more crazy stuff like this if you would like to see more videos on winter olympic sports the next couple of videos I'm gonna try to get them out pretty quick are the things like curling and other stuff like that it's pretty cool anyway for our sponsor audible.com slash smarter and if your subscription consider that deston get smarter every day thanks for listening to me I appreciate that everyone why are you putting your hands out all the time why do I always say figure skaters do that because my coach told me to over and out my balance my arms to rotate myself and to be a little more dramatic you gotta have a little finesse to it right it's awesome

COLD HARD SCIENCE.The Physics of Skating on Ice (With SlowMo) – Smarter Every Day 110

47 thoughts on “COLD HARD SCIENCE.The Physics of Skating on Ice (With SlowMo) – Smarter Every Day 110

  • June 4, 2019 at 5:32 am
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    7:52 torilla tavataan

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  • June 4, 2019 at 5:32 am
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    This explains so much!! I tried ice skating once, and a friend showed me how. He just said, angle your blades, but never explained why so I didn't quite get it. And with stopping, I figured out that putting a blade perpendicular to your direction of travel would stop you, but I kept on falling over. That's because I kept my centre of mass was always pretty much directly over where the blade was, so when I was decelerating, my centre of mass slowed down slower than my feet did and caused me to tip. And learning that hockey players decelerate fast by tilting the blade so that one point sheers through the ice plays into that as they tilt their body to add more pressure to the blade, making it difficult a little deeper as well as preventing them from falling over or losing balance at all. This is super interesting, wow!!

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  • June 4, 2019 at 5:32 am
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    as a hocky player lol jkkk

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  • June 4, 2019 at 5:32 am
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    Some time in the past someone figured out if you cut a blade in a certain way it allows people to skate well on ice. Did they figure the science out later?

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  • June 4, 2019 at 5:32 am
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    5:26. I have a pair of skates just like that. it's 700$ full carbon fiber. Very good. bauer vapor apx

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  • June 4, 2019 at 5:32 am
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    Mm you might wanna look into why is ice slippery a little more 🙂 it hasn't been proven yet last time I looked.

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  • June 4, 2019 at 5:32 am
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    7:58 finland flag 😃👌🏻

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  • June 4, 2019 at 5:32 am
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    8:12 thought you where going overlook this fact

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  • June 4, 2019 at 5:32 am
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    When Destin mentioned the physics going on in the players’ brains, he wasn’t saying that they were consciously doing math equations in their head, rather that their brain can subconsciously calculate the exact angle, velocity, speed, etc of all the maneuvers fast enough to keep up with the game.
    I think his point was that, while they may not consciously understand the math, their brain can calculate everything just fine, showing how powerful the human brain is.

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  • June 4, 2019 at 5:32 am
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    6:46 well thank you

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  • June 4, 2019 at 5:32 am
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    Amazing Video dude!

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  • June 4, 2019 at 5:32 am
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    Is there some kind of complex calculus integral that could describe the point at which an ice rink would be too cold for someone to skate on? Like, if you had a hyper-frozen rink would it make it harder to get that nanometer-thick melt layer?

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  • June 4, 2019 at 5:32 am
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    Hi i am a fan of you.. You and your videos are so amazing… Can you do a video on the science behind the Basketball… Please..

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  • June 4, 2019 at 5:32 am
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    We all have an intuitive understanding of much of classical physics (how the world works mechanically). We've all used and felt forces, torques, acceleration, momentum. Physics classes gives the theories and formulas.

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  • June 4, 2019 at 5:32 am
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    You missed speed skating short track

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  • June 4, 2019 at 5:32 am
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    TO BE FAIR. They are smart of course, until 25 years of bashing in hockey rocks the brain too much. That's what generally makes a lot of athletes become damaged beyond repair.

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  • June 4, 2019 at 5:32 am
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    So if ice is slippery because of nanometer ice melt. you make it to cold for that to happen would you still slide

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  • June 4, 2019 at 5:32 am
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    2:08–2:14 is why the hockey players who practiced after you said they hate your effing toe picks.

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  • June 4, 2019 at 5:32 am
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    Thank you for this. I learned figure skating in the very early 70s. We did not have computers, not even animation for learning how to skate. All we knew was we had 2 edges, we melted the ice under the blade, the toe pick gives us lift and stability, and how to tighten the laces over the arch of the foot, leaving the toes and upper boots looser. I haven't skated in years. But we could "feel" how to stop on the ice without over thinking it. Now, if only I could understand the physics of lift, thrust and spin/centifugal force during a jump. I never understood how that worked.

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  • June 4, 2019 at 5:32 am
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    Why do you think Hockey players have one of the highest NCAA graduation rates

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  • June 4, 2019 at 5:32 am
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    No destin he just stopped

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  • June 4, 2019 at 5:32 am
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    Best channel on YouTube. No doubt about it.

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  • June 4, 2019 at 5:32 am
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    These types of nerds are the reason we are so advanced as a people. (White people mostly)

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  • June 4, 2019 at 5:32 am
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    Great are the works of the LORD, studied by all who delight in them.
    – Psalm 111:2

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  • June 4, 2019 at 5:32 am
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    Being a player, I don't do maths

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  • June 4, 2019 at 5:32 am
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    Is there anyway to donate to smartereveryday?

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  • June 4, 2019 at 5:32 am
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    I heard that all three forms of water exist when an ice skate skates. At the blade is ice of course, but that ice is being converted to water and steam. It’s called triple point, and that’s why ice skating is so fast.

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  • June 4, 2019 at 5:32 am
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    UAH… my school has a weird hockey rivalry with UAH, Bemidji State University in Northern Minnesota had their program founded the same day as UAH's program. We've made it a rivalry thing.

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  • June 4, 2019 at 5:32 am
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    This was all common sense I already knew 99% of this. I play high school hockey

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  • June 4, 2019 at 5:32 am
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    It’s really not that hard

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  • June 4, 2019 at 5:32 am
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    If your a hockey player. . .

    Your naturally Awesome

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  • June 4, 2019 at 5:32 am
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    @smartereveryday why does fire go up? And why does smoke go towards blown air instead of away from it like it should? What’s the science behind it?

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  • June 4, 2019 at 5:32 am
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    When you HATE you physics class at school but LOVE this YouTube video

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  • June 4, 2019 at 5:32 am
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    I just lean back. You just know where to start leaning back to stop at an exact place.

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  • June 4, 2019 at 5:32 am
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    Pressure melting has been proved to be wrong. Why is it important to point this out? If you google 'pressure melting ice skate' the top site is Scholastic "Teacher's Activity Guide" Which doesn't even get to 'pressure melting,' instead the short explanation says 'ice by itself is no more slippery than a concrete sidewalk!' (wrong) and then explains "the heat generated by the blade of the skate rubbing against the ice causes some of the ice right under the blade to melt.'
    Bad explanations shut down thinking, which leads nowhere. (the NYTimes 2006 has a good article on the subject. I googled because I didn't want to just spout off on you.
    And yes top athletes are geniuses. This is worth a deeper investigation. If you did any sports growing up, you can probably name a dozen young athletes who never made it past high school, or college; they over trained and injured themselves or they just never improved– the kid who was good at everything right at the start, but never learned how to get better. (Shaq came back from basketball camp and told his grandmother, "some of those guys were better than me.'" She asked him, "How many lives do you have?")

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  • June 4, 2019 at 5:32 am
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    As a hockey player you make it sound more complicated than it is

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  • June 4, 2019 at 5:32 am
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    i think that he is over complicating it. when you take a fast turn on a bike you automatically lean into the turn so that you don't crash, even tho i have never skated, i have a feeling that it is the same concept.

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  • June 4, 2019 at 5:32 am
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    As a hockey player I am a dumbass I don’t do math while I’m playing

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  • June 4, 2019 at 5:32 am
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    This was so great to watch

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  • June 4, 2019 at 5:32 am
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    As a hockey player, I can stop immediately but I’m not thinking about physics and math… I play hockey to get out of math but I will take the compliment that we are geniuses!!!

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  • June 4, 2019 at 5:32 am
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    had my skates sharpened at a sports store, almost killed myself, to sharp and no hollow, went to a hockey pro shop, sharpened at 1/2 inch, perfect

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  • June 4, 2019 at 5:32 am
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    Uhhhhhhhh, yaaaa we definitely do what he said😂

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  • June 4, 2019 at 5:32 am
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    5:25 so I’m a hockey player and we aren’t “all” dumb brutes most of us are actually quite intelligent but we don’t really think about the math we just feel it you skate for long enough and it’s just muscle memory

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