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This is Blue Peter, but mini.
Expect epic adventures, mates, bakes, badges, pets,
presenters and your post.
We've only got five minutes, so get ready for your Blue Peter adventure.
We're in a top secret facility
because I'm taking on a very special challenge.
We're putting the laws of physics to the test.
We're going to be taking on one of its most famous forces to
push science to the limit.
This is Mission Friction.
This year the BBC launched Terrific Scientific, which is
all about getting us excited by science.
We wanted to get involved in the biggest way possible, so I've called
upon science expert Greg Foot to help us test the powers of friction.
Greg, I'm so glad you're here to help out.
Firstly, please tell me - what exactly is friction?
Right, so whenever you take two objects and they touch
-or they rub together, you get a force of friction between them.
-Try this. Rub your hands together.
-What do you feel?
They're getting hot.
so you're having to put in energy to overcome that friction, and some of
that energy is getting transferred into heat, which you can feel.
OK, so how do we actually test friction?
I thought you'd never ask.
-What exactly is this?
-I've wanted to do this for ages!
This is the recreation of a very famous experiment that takes
And then it interleaves the pages together.
You take the bottom page from this book
-and then you put the bottom page from this book on top of it.
And then a page from this and a page from this,
kind of wrapping the pages on top of each other, interleaving them
and you're left with that. And then they lock together like that.
-I can't imagine how many hours that takes.
For this test, we're using two chunky books, and the rubber band
is there purely to keep the book covers from flopping about.
It's going to take a massive force to pull it apart.
-Yeah, but the question is, how massive?
Well, we need something quite a lot stronger than us, that's for sure.
How about two vans which will drive in opposite directions to try
and pull the books apart?
And what I've done is I've put in this thing,
this is called a load cell.
What this is going to do is tell us the maximum amount of force that
these vans are pulling on either side of this bad boy book rig.
What's going to happen, is it going to rip,
is it going to survive? There's only one way to find out.
Three, two, one... Pull!
Look at that!
She is smokin'!
-Let's see what happened.
-Let's go in, are we good?
-Is it safe? Yeah.
We're coming in, guys!
-I can't believe this didn't break.
-So what does that mean?
That is like hanging 18 adults off this book rig. But you know what?
-I think we can take this bigger.
-What do you mean?
To be honest, you really do not want to know.
Greg has a super-sized experiment that will really test these
books, and it's all going to take place at the home of Blue Peter,
at Media City in Salford.
-So, Greg, we've built our own mini Media City here.
My plan is I want to dangle you underneath those interweaved books.
Attach the other end to a zip wire, OK, so this is you here,
and then send you 235 metres down a zip wire,
all the way down into the piazza, dangling using nothing but friction.
-Is this a joke, are you joking?
I actually can't get my head around that.
This is a proper, proper Blue Peter challenge,
it doesn't get more extreme than this.
This challenge is so big, we need another presenter,
someone with nerves of steel, and a matching suit, we need Radzi.
As we get into position, 35 metres up, it all becomes sickeningly real.
I didn't think it was that high.
And now that we're up here, looking down to where I need to go,
-oh, my tummy just went.
-That's a long way.
My tummy just went. I feel a bit sick. I'm not going to look...
I'm just going to look... I'm going to look this way.
-Do you want to step over here, then?
-No, I don't.
Come on, it's not as bad as you're making out, you know that.
-You ready to go? You look ready to me.
No, no, No, I feel really scared! Do I... What do...
I'll keep my arm here a minute, so you come and shuffle up to my arm.
Why are we trusting a book to get me to the other... Ugh!
I've just looked over again...
Here we go, here we go, here we go!
It's just the friction between those pages!
I'm going so fast!
-I cannot believe that worked!
-How was it, Linds?
Get me off, get me off!
-Mate, that was amazing.
You know what, the speed really picked up.
About halfway through, that went from being fine to actually,
how am I going to stop?
The whole way I was like, "Come on, science! Come on, friction!"
I wasn't nervous at all watching Lindsey.
But now I know that I'm using the same books that she used
and the weather's getting worse and it's raining...
Well, think about what normally happens when paper gets wet.
-It gets all soggy and mushy.
-Yeah, and it tears easily!
Yep. I don't think it's going to be able to take as much load on it
-as soon as it gets wet.
-Oh, don't say that, Greg.
Come on, come on, Radz... I think he's near.
I'm going to do it! Wish me luck.
So will two soggy books hold Radzi's weight for 235 metres
at speeds of over 25mph?
Cue the countdown.
The harness seems to work!
-Greg, you're right! It works!
Join in every Thursday on CBBC!