>> As long as it goes in an arc, the stream will stay taut.
That has to do with the physics.
Okay, here we go.
I've got my yo-yo bag.
In my yo-yo bag I have a free-spinning,
non-returning yo-yo.
Okay [fizzing sound] hear that?
Okay, that's the sound of precision ball bearings.
So here, spin a yo-yo.
I've got to do orbit the Earth.
There we go and then it's orbiting slowly
but it's spinning fast and then I'm going to do around the moon.
Look at that.
And then I'm going to do the tether assist.
Now, normally we call that "Man
on the Trapeze," but it won't catch.
And so it just bounces off the string.
And it's kind of like the tether technology we use
for satellites and things.
So I call that the "Tether Assist."
And let's see if I can get it to come back down.
Ah, there we go.
And because I'm in space and I can,
I get to name these yo-yo tricks as I invent them.
So I call this "Shoot the Planets."
And I'm spending more time training to fly the robotic arms
so I can snag this little spacecraft coming up here
in a week or so called "Drag."
And I haven't been spending as much time
as I should working on my yo-yo training.
So I've been ignoring my yo-yo training,
so it may take a couple of times to get this trick correct.
And it just shows how I've got misplaced priorities.
Here we go.
Oh, so far so good, orbit the Earth.
And now, it's like keep it moving in an arc,
there's two, there's three.
Oh, oh, how about that.
Let's see if I can get it to come back.
Ah, okay. So now it's spinning really fast.
We'll go ahead around -- oh, I like this.
I'm going to do "Shoot the Planets" again.
So here's that, here's that, here's that.
There, that was a good one.
That's a keeper.
Okay, now I call this "The Asteroid"
because it's basically uncontrolled,
the string is lived and it's just bouncing back and forth.
So this trick is "The Asteroid."
And you have to be careful because if it comes back
in an uncontrolled way, it could end up hitting you in the head,
and I call that the "G Bonk."
Another thing about yo-yos, there's a lot
of physics involved in this, a lot of physics.
It change of angular momentum.
With the yo-yo spinning, angular momentum of the yo-yo moving
in an arc as a system and then the linear momentum of it going
in and out of the string, and then, of course,
there's energy expenditure and that's because you got bearings
and friction and drag with the air around it,
and drag with the air is kind of small.
So you have all of these neat pieces
of physics working on this.
And it's good to understand the physics
of your recreational activities.
So if you like doing yo-yos, you should read
up about how they work, how the physics works.
And it will benefit you in several ways.
One way it'll benefit you is you'll be able
to have some delightful conversation.
You can impress people by talking
about the physics of your yo-yo.
And if you're a guy, just think you can impress the gals
by talking about the physics of how your yo-yo works.
And, of course, there's going to be a classic gals
that won't be interested in that; you won't impress them.
But then those are the kind you don't want to be around.
And then if you're a gal, and your yo-yo, again,
learn the physics, and when you talk about the physics
of how the yo-yo works in addition
to doing your yo-yo tricks, you can impress the guys.
And, of course, there's going to be some guys
that won't be impressed because they don't like physics.
And you don't want to hang
around those kind of guys anyway.
But there's even a more important aspect of this.
If you learn the physics of how the yo-yo works and you can talk
about that, that means you've learned a certain amount
of physics.
And when you learn a technical subject like physics,
guess what, it helps you get a good job.
And then, of course, when you have a good job you can afford
to buy these fancy yo-yos and you can use your spare time then
to do even more work with your yo-yos.
So here we go, let's see if we can do it again.
So orbit the Earth, orbit the moon, orbit the moon again.
There's a tether assist, okay, tester assist,
shoot the planets and come back.
Hot dog, look at that!
[ Silence ]
Again, I'm going to try "Shoot the Planets" again.
Ah, that's a string jam.
Oh, man! And it hurts your finger.
It hate it when that happens.
Let's see if I could get this.
One of the neat things about video is that you can edit
out all these takes when you're gooning [phonetic] up, you know.
And then you can make it look
like you're a real yo-yo champion.