The Physics of Pumping on a Skateboard - Fully Explained + Easy to Understand!
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- Опубликовано: 15 ноя 2020
- I have been wanting to make this video for a very long time now, and finally here it is! A full, accurate, explanation of how to pump on a skateboard and exactly why it works, complete with experimental proof (actually showing my explanation from 5 years ago to be incomplete)
This video was a lot of fun to make, and I'm excited to get the ball rolling again on uploading skateboarding videos now that my foot is finally starting to feel good enough to actually go skateboarding.
Thanks for all of the support in the meantime, and just know that all of you guys make the long hours I put into these videos way more than worth it!
...and as promised at the end of the video, here is a link to the video on skating bowls: • How to Skate Bowls - G...
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Never Stop Improving!
#skateboarding #physics #neverstopimproving
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Physics major here. Excellent video. Ppl at the park often talk in terms of speed, not wrong, but I think the conservation of energy is a far more effective conversation. Great use of normal vectors and vector components in ur explanation of forces as well
This is the best pumping tutorial I’ve ever watched
As an engineer and begginer skater, this was what I needed to understand how to pump. Great video!
The legend is back 🙌
🤟
I’m a big time big bowl skater and you just changed my life. I know the muscle memory and have the strength to maintain solid speed. However I think understanding this in depth is going to help so much.
In my head I see it almost as jumping off of a slanted wall into flat ground. If you can add that factor you will go even faster than just standing up at the bottom.
After watching tons of instruction video's and trying to remember all the actions I had to execute.... It took about 10 seconds in this video to actually understand the physics and now I don't have to remember anything because I simply 'get it'. Best tutorial ever. Thnx heaps
Love hearing that! Keep up the good work!
bro no way Justin Lauria thE GOAT IS BACK 2020 might not be so shitty after all
I am an engineer learning to skate. That was exactly what I needed. Very clear explanation. Onece I know how it works then I do not think but do.
This is terrific, especially the experimental part 'No pumping Vs. crouching only Vs. pushing off only'. Thanks Justin!
I've got one question: should I push off equally with both feet or should I press more with the back foot? Thanx for your time!
Glad to see ya back bro!! You definitely in the best state possible right now.
So cool that you’re back. I’ve learned so much from your older videos. Really hoping this is the start of more. And on this topic-I was just figuring our that the push was as important as the crouch a few days ago. Still working on my pumping, but I think you just handed all of us the keys.
From what I understand, the physics is about angular momentum. On a circle L = mass * velocity * radius. Because L is constant, you can increase the velocity by reducing the radius. You reduce the radius at the top curve by compressing and at the bottom curve by extending. I think switching between compressed and extended when going straight doesn't affect your momentum, so it's important to change position in the curved parts of the ramp or bowl. More details and math at www.real-world-physics-problems.com/physics-of-skateboarding.html
Yes!!! Thanks fellow accurate physicist, you've said it all, this it the correct explanation.
Yes
Ur back!!! I really missed ur content, ur my favorite skating RUclips channel so keep up the skate content!
THE KING RETURNS!!!!
Duude I just learned how to pump today because of your videos. Coming back home after successfully pumping in a ramp at my local skatepark and seeing a new video of yours about how pumping physics works is truly satisfying
Good to see you posting a skate video again Justin. Good to see some local spots too. Interesting topic. I’ve often wondered about the physics of pumping. I do it, but I don’t know how / why it works. Good explanation.
Good to see you are back, hopefully this is a start of you making skating videos again. 🤙🤙
for ages i've been looking for a tutorial that explains pumping properly, i've been thinking to myself 'I don't think i can trust a tutorial that doesn't explain the force vectors'. and this is spot on for it!
Also, great hat!
Nice its great to see you back :D
Woohooo!, your back Justin, we missed your awesome tutorials bro, yessss, this is a good day
Great video, thanks for sharing. I was looking for a physics-based explanation for biking a pump track and I think this is a good parallel.
This is so awesome , yesterday I did my best pumps ever and after watching this video I’m going to do even better today 😄👊🏻
So excited to see this in my notifications!! 😍
same here, i was like...oh yeah the GOAT is back online.
Great video! Exactly what I was looking for, with the scientific explanation for pumping.
Bro!!!!! You!!!!! You are the one!!!! THEEE ONE!!!!! Pumping finally makes sense to me!!!! Cant wait to try it out after healing from my ankle injury! Bro! Love you man!!!!!! #muchlove #suchappreciates
I can’t believe he is back. Let’s goooooooooooooooooooooooooo
YES HE IS BACK LET'S GOOOOOO
Finally a video that truly explains pumping! I just learned this technique on a 4 ft half pipe. Finally able to go top to top. Slammed hard and got some wicked burn on my elbow and a bruised hip. But damn it was awesome! Hopefully be able to drop in soon.
Thanks 🙏🏽 -always wanted an actual break down of how n why “pumping” works!
Thank you for this very helpful video - you are the first, who really made me understand the concept and practice of pumping!
I appreciate you saying that! I think it's so cool how it works
wonderful video!
Great video, really enjoying your content.
thanks mate. best video out there
really great explanation, thank you!
Aww man I'm glad you enjoyed it, always nice to meet a fellow skate nerd 😝
This is the best pumping tutorial on the internet. Great work, thank you!
Thanks very much Sky!
I was just thinking today that I wish there was a video that explained the physics, and here it is!
Hey I'm really sorry to disapoint but this isn't the actual physical explanation of how pumping works :/
There's a video called "The physics of pumping a longboard" that explains (in a pretty poor way unfortunately) how it actually works.
great vids always
My man your work is good. Please keep it up!
Rock and roll brother! 🤜🤛
love the correction you did
Welcome back
Also 1:58 is really satisfying
Welcome back!
Thank you for the video, can't wait to give these a shot next time I skate!
I spend a majority of my time skating just pumping around endlessly at the skatepark. It is so dang much fun.
this video is great!
So awesome!
Nice one, champ!
jezzzz you are awesome! Hugs from Brazil!
great video, thanks so much, cheers
i've watched a lot of these tutorials, and this one is best of all. It combines every possibility in one video, thanks for creating this
Thanks man!!
Hey, the way it actually works is not as shown in this video but really by shortening the distance between your center of mass and the center of curvature of the curved part of the ramp :)
I will try to make a video myself to illustrate exactly how this works more clearly but this guy called Garrett Milliron made a video called "The physics of pumping a longboard" which shows the correct explanation in, unfortunately, a less understandable manner.
Hey Raphael, maybe spend more time making the video and less time copy-pasting your comment into every other reply on these videos. I'm sure you have valuable things to say but I've encountered doomsday evangelists with more reserved and tactful output.
@@raphaelpoitou8609 I wouldn't be so quick to discount this explanation with statements like "the way it actually works......". What you have described is the Curvilinear motion explanation of movement around a curve which describes forces on an object in a reference frame tangential to the path it is travelling, at any instance of time that motion can also be analysed using Rectilinear methods which use the resultants of forces acting on an object during its motion in a rectangular reference frame. Of course I still can't guarantee this explanation is correct without breaking out my old Dynamics textbook and doing a few problems both ways and then comparing the directions of forces etc to his explanation but these problems can definitely be solved in both ways with both explanations being the way it works, just using different concepts.
Great Video! Thank you for speaking slow and clear! Back in the 1990's we Called it Compressing!
Really?! Compressing? That is so cool to learn!
This video fixed my inability to tic tac. I wasn't utilizing the friction of the wheels and pumping to generate momentum in the direction I wanted to go. I have never heard it explained like this. Thank you and keep up the great content. +1 sub
Rock and roll sir, thank you for the comment!
I love your videos SO MUCH ! Thanks a lot for teaching us
Rock on Esteban!!! 🤘
Hey, the way it actually works is not as shown in this video but really by shortening the distance between your center of mass and the center of curvature of the curved part of the ramp :)
I will try to make a video myself to illustrate exactly how this works more clearly but this guy called Garrett Milliron made a video called "The physics of pumping a longboard" which shows the correct explanation in, unfortunately, a less understandable manner.
It's a good thing that you are 'not stopping imporving.'
Free body diagrams 👀 nice job! They're a great visual
The surfing community needs someone like you! Trying to apply what I learned here to surfing
this was a great video
Great video I don’t even skateboard I was just wondering this question and surprisingly there aren’t a whole lot of videos that go over the actual physics
Hey, the way it actually works is not as shown in this video but really by shortening the distance between your center of mass and the center of curvature of the curved part of the ramp :)
I will try to make a video myself to illustrate exactly how this works more clearly but this guy called Garrett Milliron made a video called "The physics of pumping a longboard" which shows the correct explanation in, unfortunately, a less understandable manner.
Longboard newbie here. Gotta get the muscle control gains 😅 thanks for the tips!
Between this and your other video, I finally pumped after a few days of trying. If anyone else is having trouble pumping, my issue was that when I would ride back down fakie, I wasn’t bending my knees enough and sucking my knees into my chest as I started to pump.
as always good video 😀 ! i need fly out video 🙂
Same
That skatepark looks awesome
great lesson, this is a habit I must cultivate
lmao my physics teacher should show this to his classes to show how physics matters in the real world - love the video, nice job!
Haha that would definitely be epic! Thank you 🙏
Hey, the way it actually works is not as shown in this video but really by shortening the distance between your center of mass and the center of curvature of the curved part of the ramp :)
I will try to make a video myself to illustrate exactly how this works more clearly but this guy called Garrett Milliron made a video called "The physics of pumping a longboard" which shows the correct explanation in, unfortunately, a less understandable manner.
So basically if your physics teacher showed this to his classes to illustrate anything else than kinetic energy turning into potential energy and vice versa (which was the correct part of the video) then he would be incorrect as well.
Hey Justin, thank you for the video. The explanation is better than the old one, but i think still not accurate. I believe that the key point is that you have do work against the centrifugal force (~v*v/r, where v is speed and r the radius of the transition). That is why it works good on smooth transitions and less good an sharp angles.
Banks and transitions both require us to do work, so he wasn't wrong, just not as thorough as possible.
What I might call "wrong" is saying the total energy of the system increased.
Actually, he only looked at gravitational potential energy and not the chemical potential energy which we convert into kinetic energy by pumping.
Hey, the way it actually works is not as shown in this video but really by shortening the distance between your center of mass and the center of curvature of the curved part of the ramp :)
I will try to make a video myself to illustrate exactly how this works more clearly but this guy called Garrett Milliron made a video called "The physics of pumping a longboard" which shows the correct explanation in, unfortunately, a less understandable manner.
And so since you seem to know a bit more about physics, the exact equation that explains everything is L = I*omega
and since I = mr^2 (where r is the radius so the distance between your center of mass and the center of curvature of the ramp) and omega = v/r, L = m*r*v, and m (your mass) is a constant, L stays constant for an isolated system (in this case the you-skateboard system) and since r gets smaller, v (your linear velocity aka your speed) has to get bigger in order to compensate for r getting smaller so that L stays constant.
gr8t video!
I've been bowl skating to improve my surfing. This really helped me understand why I have so much trouble generating speed on my backside. Thanks! BTW from the background in the videos are you in ATX?
Great video thank you. I’m 56 and learning to skate a bowl and your tips are awesome!
Nice! and thank you!
Hey, the way it actually works is not as shown in this video but really by shortening the distance between your center of mass and the center of curvature of the curved part of the ramp :)
I will try to make a video myself to illustrate exactly how this works more clearly but this guy called Garrett Milliron made a video called "The physics of pumping a longboard" which shows the correct explanation in, unfortunately, a less understandable manner.
Finally!!!!!!!!!!!!
I'm geeking out over how you increased the kinetic energy as you pushed forward at 1:50. Gotta admire the attention to detail.
Well, I appreciate YOUR attention to detail
You know Arnold’s talkin bout that pump! 🤣
Great video 👍
Thanks brotha 😉
Thank you so much! This helped me a lot with my pumping strategies
My inner engineer is happy watching this! Really great video and explanation 👍
Thanks a ton! 💪
Hey, the way it actually works is not as shown in this video but really by shortening the distance between your center of mass and the center of curvature of the curved part of the ramp :)
I will try to make a video myself to illustrate exactly how this works more clearly but this guy called Garrett Milliron made a video called "The physics of pumping a longboard" which shows the correct explanation in, unfortunately, a less understandable manner.
HOLY CRAP HE UPLOADED
Former physics student here who was just wondering about this...This is so great!
Hey, the way it actually works is not as shown in this video but really by shortening the distance between your center of mass and the center of curvature of the curved part of the ramp :)
By the way just wanna throw that out here, same thing for me, I was a former physics student who wanted to understand how it worked but the explanation in this video just isn't correct, as you can easily see by the fact that you could gain speed by only pumping when going "up" the transition and never down the transition, and when you go up the transition, you can obviously not "push on the ground" since, as his vectors show at some point in the video, if the thing creating speed was pushing on the floor for it to react, it would push you *backwards* and not forward, slowing you down instead of accelerating you.
I will try to make a video myself to illustrate exactly how this works more clearly but this guy called Garrett Milliron made a video called "The physics of pumping a longboard" which shows the correct explanation in, unfortunately, a less understandable manner.
Great video! Still can't get to carve endlessly in the bowl. I guess it's not a thing One practice session... And I find the backside carve more difficult. Like I'm gonna fall on my face!
This is great. I feel like the speed boost you get in the “just crouching” scenario is from the fact that your crouching motion stops *before* the end of the ramp. At the moment when you get to the bottom of your crouching motion, your body ends up pushing against the earth to decelerate the downward crouching motion. So the pure crouch is really like a stealth push. If you had a shorter ramp and your crouching down movement ended on the flat ground rather than on the ramp, you probably wouldn’t get the speed boost.
I completely and totally agree with you
@@NeverStopImprovingSBThanks for responding and for putting out these awesome videos!
great explanation! thanks
You're Welcome!
Hey, the way it actually works is not as shown in this video but really by shortening the distance between your center of mass and the center of curvature of the curved part of the ramp :)
I will try to make a video myself to illustrate exactly how this works more clearly but this guy called Garrett Milliron made a video called "The physics of pumping a longboard" which shows the correct explanation in, unfortunately, a less understandable manner.
Nice vid 💪🏻
Thank you 🤜🤛
Back!
👑
🙏🙏🙏
This video is excellent and I believe it kinda disproves rockets, since in space they have nothing to push off of..
that's like if you were holding a bowling ball and standing on a skateboard and you threw the bowling ball behind you
Nice Skate Park Set UP.... Can you send the Design plan
Noice!😃
So that is way I couldn't get the hang of pumping, Thanks!
Hey, the way it actually works is not as shown in this video but really by shortening the distance between your center of mass and the center of curvature of the curved part of the ramp :)
I will try to make a video myself to illustrate exactly how this works more clearly but this guy called Garrett Milliron made a video called "The physics of pumping a longboard" which shows the correct explanation in, unfortunately, a less understandable manner.
Oh and btw I'm adressing this comment directly to you Never Stop Improving, since I know you might end up seing all of my kind of "copy paste" comments : your video was really well done, looked good and you sounded really convincing, I'm just trying to bring the correct explanation to people who want to learn the actual physics behind this incredible phenomenon that is pumping, as you thought you did by correcting yourself from your own older video. I hope you will understand and not delete all of my comments.
Kindly,
Raphaël
Skateboarding is for nerds! Thank you for this
how about for the consecutive humps on the pump track?
I've been searching RUclips for this exact video
Awesome man, I hope you found it helpful 🤙
He scienced the shit out of this!
Hey, the way it actually works is not as shown in this video but really by shortening the distance between your center of mass and the center of curvature of the curved part of the ramp :)
I will try to make a video myself to illustrate exactly how this works more clearly but this guy called Garrett Milliron made a video called "The physics of pumping a longboard" which shows the correct explanation in, unfortunately, a less understandable manner.
yep i totally know a lot of algebra and science🙄
Good news. This requires zero algebra, just arrows.
If you look at an introduction to vectors, it doesn't really require numbers, the visual is pretty intuitive.
From there, if you find vectors interesting, you might learn some algebra or science.
In fact, a vector is a first order tensor, and Einstein was said to be unsure about his tensor algebra and had it checked by other mathematicians.
@@OMNIPHEAST yup i understood this 😅
Tibees, 3brown1blue would be fucking proud. Thank you so much for this
Gracias. Estaba muy confundida con las demás explicaciones que solo dicen "empuja". :)
I don't understand any of this but it's cool regardless
Okay so I am pretty sure this explanation is wrong.
Tl;dr : Pumping is made possible by the conservation of angular momentum, not pushing off of the ground.
There is a video called "the physics of pumping a longboard" that explains the actual science that makes pumping possible. The video I am mentioning includes a lot of incorect information and isn't clear at all if you have never heard of the subjects used in the video, but the idea is the correct one : by bending down your knees on flat parts which doesn't affect your linear speed and extending them in the angular or curvy parts which reduces the distance between your center of mass and the center of the circle drawn by the angular part of the ramp, you generate speed every time you pass a curvy section.
I think I might do a video myself to try and explain this concept in-depth while keeping it simple so everyone can understand it with everything I have learned about it in the past week I have spent researching the matter.
What was incorrect?
First consider the transition from flat ground to uphill. It should be obvious that if you push down on the board on flat ground, this will not make it to forward at all. Putting a hill in front of you doesn't change that. The force arrows in the video which show a force going up the hill also show a force going away from the hill, which cancels out in the forward direction as you expect. The only way to push the board forward up the hill is to push at an angle, i.e. lean back and push away from you. This will push the board forward, but obviously you would fall off. You can apply the same analysis when you're going downhill; we can ignore gravity to look only at the force you can add yourself. If you push parallel to the ground you're not adding any forward force, because you are pushing the board backward exactly as much as the ground pushes you forward. But if you push straight up, as the video diagram shows, then you're pushing the board away from you and you'll fall back. In the same spirit of experimentation shown in the video, find a long, fairly consistent incline, and push multiple times as you roll down (but before you begin to level out). If pushing works just by pushing off the incline, you should be able to gain more speed each time you stand up. But I'll bet $100 that you'll go no faster than rolling.
Oh I realized Garrett was probably asking what's incorrect about the other video mentioned. It makes sense to me, and makes one easily testable prediction: you can't pump a transition with a smaller radius than your center of gravity. So let's get a tall person to pump some 3' radius transitions.
@@AdrianQuark I'll start by answering your second comment because I'm struggling to understand the first one rn. So coming from someone who has built his own mini-ramp, a 3 foot radius transition would be ridiculously small, since a 3 foot high transition (what I have built myself) required something close to 8 ft of radius if I recall correctly. and anyway, yes it is indeed harder to pump in a 3 ft mini ramp than on a 9 ft bowl, because you have less time to extend and bend your legs.
@@gradies Hey! First of all thanks a lot for making your video and giving me the keys to understand how pumping works! Well the main things I was able to point out were you said at some point that the center of mass was geting closer to the "radius of curvature" instead of center of curvature, so basically the opposite, you said that the angular momentum had to stay constant, which was correct, but then you said it had to stay equal to zero, which was obviously wrong when you're in the middle of the curved transition, since you have positive speed, mass and radius, so it's constant, but not null.
Also the reason why I'm saying your video is not very clear is because you didn't developp and simplify the equation from L = Iw to L = mrv. Apart from those things, great video and great explanation!
Oh so it's basically "apply upward force to reduce the pressure of your weight on the board so it doesn't slow down".
Cool, thanks!
What's crazy is I thought it was impossible to gain speed by pumping then as I started riding I notice that I just started to do it on my own. You can't tell when you are doing it right because you Wheels and Board makes a different type of sound as you pump along.
Hey he’s got 70K now congrats man. Oh yea and just wondering WHERE IS THAT SKATE PARK I DONT GOT ANY GOOD ONES WHERE I LIVE MAN
Umm they're in Pflugerville, Texas. Where do you live where there isn't anywhere to skate?! That sounds awful 👎
Well there’s stuff to skate but I’ve already done everything there a hundred times except the bowl at the bottom there is a drain pipe that pops out so if you hit it then you’ll slam into the floor
he has explained it using proper physics.
Hey, the way it actually works is not as shown in this video but really by shortening the distance between your center of mass and the center of curvature of the curved part of the ramp :)
I will try to make a video myself to illustrate exactly how this works more clearly but this guy called Garrett Milliron made a video called "The physics of pumping a longboard" which shows the correct explanation in, unfortunately, a less understandable manner.
In my opinion (which...is just an opinion xD i'm no physics student etc) the crouching part does help as long as you do a sort of 'little jump' just before entering the downhill part of the transition.
I try to explain my self better: the higher the transition is, more speed you gain. So if you raise yourself by pushing with the legs towards the floor (while still standing with the feet on the board, not like an actual hippie jump) just before you hit the downhill, you DO increase your potential energy, thus increasing the resulting kinetic energy (because you fall from an higher point). Then, with the proper timing, adding the crouching just after you hit the downhill will increase the drop/fall even further and give you more speed.
This is valid only if you are already moving towards the downhill transistion...I don't think it work if you try staying still on the top of it and dropping in (like in the experiment with the timers in the video).
Dunno, just an opinion :D does it make sense to anyone?
It helps also. Like, going down a bank, you'll go faster if you sort of acid drop from the flat to the bank. This way, a portion of your weight is not applied to the downward vector until you already have cleared some of the bank. This way you lose less momentum to friction.
Then, pump out of the bottom, take advantage of both.
Hey, the way it actually works is not as shown in this video but really by shortening the distance between your center of mass and the center of curvature of the curved part of the ramp :)
I will try to make a video myself to illustrate exactly how this works more clearly but this guy called Garrett Milliron made a video called "The physics of pumping a longboard" which shows the correct explanation in, unfortunately, a less understandable manner.
Can ypu explain the pumping technic on flat streets? (Getting faster by doing sharp turns )
I am not certain, but I believe it is a similar principle, you are using the turn of your board and the friction it creates to push off against slightly sideways which also contributes to the speed in the direction your board is traveling, pretty much the same idea as pumping in a bowl, but relying entirely on friction
I believe the force could be applied through pushing horizontally or dropping your weight on to one side of the board causing the board to turn sharply. This is definitely just assuming though
Hey, the way it actually works is not as shown in this video but really by shortening the distance between your center of mass and the center of curvature of the curved part of the ramp :)
I will try to make a video myself to illustrate exactly how this works more clearly but this guy called Garrett Milliron made a video called "The physics of pumping a longboard" which shows the correct explanation in, unfortunately, a less understandable manner.
Could you explain why learning to pump taught me to Ollie over curbs?
You are an anomaly sir 🤔