Stringless Yo-Yo!

- Can you just like ... Yo-Yo like a basic Yo-Yo - Yeah, like this - But this is not a basic Yo-Yo No That is awesome Nicely done! This is Ben Conde, he's got a brand new channel on YouTube Which is about Yo-Yoing like a crazy person But, I'm going to figure out how this is possible How this is possible with a string that's not connected to the Yo-Yo To get it to do all of these insane things Wow Gosh! How did you learn to do that? That's crazy! Uh Just a lot of like lonely saturday nights So watch this motion here, there, and then you tug up -Yeah you got it -(Derek Laughs) This is not gonna happen! You got it, dude! Pull up- ooooh, that was close! Tug up! Aww... -Pull up! There you go! -(Derek cheers) So, how does this work? When the yo-yo is released it unspools as it falls, gaining kinetic energy and rotational energy from the gravitational potential energy it had to start with yo-yos can spin really fast, around six thousand revolutions per minute. That's about as fast as most car engines can turn over, and this is important because it gives the yo-yo gyroscopic stability which means its axis of rotation is maintained even if there's a breeze or some little disturbances now since the yo-yo has a lot of angular momentum it continues spinning in the same direction but when Ben tugs the string he pulls it from one side of the yo-yo over to the other so now as the yo-yo continues spinning it binds the string to the spool and starts to roll up the string If you look closely at this shot you can actually see the exact moment when the string binds to the spool preventing the yo-yo from unravelling further and falling off the string. That's all there is to it, yeah, there's no science behind it at all. To release the yo-yo Ben throws it out and upwards without pulling back so it completely unspools and continues spinning at the same high rate of rotation, but how does he catch it with just a string? So the way yo-yos actually do roll up is there's friction pads inside the yo-yo these ones are made out of silicone you see this like little gap that inside when that string goes inside that creates friction and while it's spinning it rolls the yo-yo up So if Ben can lodge the string in the gap of the yo-yo it catches on the friction pads and the yo-yo starts to roll up the string again Even without the friction pads when the string wraps around the axle it creates a significant amount of friction in the same way that ropes wrapped around bollards hold big ships to their docks, the amount of tension a coiled rope or string can hold is given by the belt friction equation. This equation shows that the force the string can exert on the yo-yo increases exponentially with the angle the string makes around the axle so even a few turns around the yo-yo allow been to pull it back into his hand (Derek): What is your favorite yo-yo moment? My freestyle in 2011 the crowd stood up and it felt good It brought tears to my eyes but I went back to my hotel room to cry 'cause I was happy It was a good moment Hey this episode of veritasium was supported in part by audible.com a leading provider of audiobooks with hundreds of thousands of titles in all areas of literature including fiction, nonfiction, and periodicals and because audible supports Veritasium, they give a special offer to anyone who watches this show if you go to audible.com/veritasium you can download and listen to any book for a one month free trial. In the book i'm listening to at the moment is a classic of science fiction it's Kurt Vonnegut's slaughterhouse-five an awesome book about becoming unstuck from time it involves aliens and world war two and kind of this weird time travel but it's just a phenomenal piece of writing so if you haven't read it or listened to it and you can check it out for one month free trial just go to audible.com/veritasium I really want to thank audible for supporting me and I also want to thank Darren Dyke who filmed the slow-motion shots in this video he is phenomenal that's why this video is so cool and also of course Ben Conde because he spent years of his life perfecting the skills that you saw demonstrated here if you want to see more of him you can go check out his channel, link is in the description so again I want to thank all of these people and I want to thank you for watching

Channel: Veritasium

Views: 9,524,363

Rating: 4.8770027 out of 5

Keywords: veritasium, science, physics, yo-yo, off-string, string, toys, stringless, no string, gyroscopic stability, angular momentum, conservation of momentum, revolutions per minute, spinning, friction, friction pads, catch, throw, yoyo

Id: -i0InwW0V9k

Length: 4min 52sec (292 seconds)

Published: Tue Jun 28 2016

Reddit Comments

[u/Rooster022]

> stringless

I think most people on this sub understand how yoyos work but a cool video non the less.

Yoyo tricks did a very in depth video about 1a binds a few months ago that contains similar information but does more in depth.

[u/Jazooka]

1. Man, Ben is really hyping his new videos a ton. You'd think he was running for office or something.
2. They end the video talking about Slaughterhouse-Five. I approve.
3. Heheh, the other guy said "bollards".

[u/BeardedThomas]

<3 Dirk from Veristablium.

[u/Drostafarian]

Ben Conde!

[u/GinkoWeed]

Veritasium is awesome. I love that he did a video on yoyos.

[u/DocPop]

Wow, this video is fantastic. I can't wait to show it to all of my non-yo friends.

Great job, Ben!

[u/tofu28]

Great video, it makes me want to get into 4a.

[u/jeromeie]

Terrific interview, terrific post processing, and Ben shared some heartfelt moments too. Good Shit!

[u/aloehart]

I really should get a flight and try out 4A