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[Music plays]
(Ollie) What is spolling?
And what does it have to do with hula hooping?
I’m Ollie, from CSIRO,
and this is international hooping superstar
and Editor of the Helix magazine, Jasmine Leong.
[Music plays]
(Mitch) We want to be able to make a device
that can do this hula hooping movement for us,
and I’m kind of getting inspiration here from
this gadget here, I think it’s called a gyro ring,
you’ve probably seen them before.
Let’s just take a look.
Now that movement that you’re seeing there,
scientists call it a combination of spinning and rolling,
and I guess they call it spolling,
S-P-O-L-L-I-N-G.
Now spolling is a weird kind of movement.
It’s
fantastic to do,
but how do we get it to work?
We need to make something like this now.
Things you’ll need
I’ve gone to the hardware store and I’ve got one of these
threaded rods, it’s a rod with a thread on it,
and so that’s a spiral thread.
And what you can do is get a couple of hex nuts,
hexagonal nuts, that you can screw one on one end
and in a moment I’m going to screw another one on the other end.
But before we do that we need to add some washers.
And you can have a go trying different sized washers,
maybe some big ones and small ones,
find out which goes fastest,
and which one looks the prettiest as it falls.
Check that out.
Can you figure out what causes that motion?
What decides how fast it falls,
and what is the force that’s powering that right now?
If we put a few washers on there, let’s add five
one, two,
three
once we’ve got five
it should be enough that it produces a really nice effect for us.
We’ll finish off
with a hex nut on top
holds them all in.
And then for safety, see
we don’t want to poke anyone’s eye out,
just going to get a couple of squash balls,
punch a hole in the end of the squash ball there
and pop it on the end just for safety.
We don’t want any blindness caused by this.
So this thing here was invented by an excellent inventor
called Vogrig,
and it was called a Vogrig rod
for obvious reasons.
But what we’re going to do is
I’ll get one more squash ball on that side.
We’re going to take a look at the way these things fall,
and hopefully get a better idea
about what’s actually going on here, and what the forces really are.
So don’t forget to leave a comment,
and like us, and share, and all that kind of stuff,
subscribe to our channel if you want more of this kind of stuff,
and let us know, how did your Vogrig rod go,
and what experiments did you try to make it work differently
or better.
See you next time.
It’s really intriguing. I could stare it for ages.