Mission Friction Challenge Blue Peter Bite


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Mission Friction Challenge

Lindsey and Radzi are joined by science expert Greg Foot to test the power of friction with an incredible zipwire challenge.


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This is Blue Peter, but mini.

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Expect epic adventures, mates, bakes, badges, pets,

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presenters and your post.

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We've only got five minutes, so get ready for your Blue Peter adventure.

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We're in a top secret facility

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because I'm taking on a very special challenge.

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We're putting the laws of physics to the test.

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We're going to be taking on one of its most famous forces to

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push science to the limit.

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This is Mission Friction.

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This year the BBC launched Terrific Scientific, which is

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all about getting us excited by science.

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We wanted to get involved in the biggest way possible, so I've called

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upon science expert Greg Foot to help us test the powers of friction.

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Greg, I'm so glad you're here to help out.

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Firstly, please tell me - what exactly is friction?

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Right, so whenever you take two objects and they touch

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-or they rub together, you get a force of friction between them.

-OK.

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-Try this. Rub your hands together.

-Yeah.

-What do you feel?

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They're getting hot.

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Yeah, exactly,

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so you're having to put in energy to overcome that friction, and some of

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that energy is getting transferred into heat, which you can feel.

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OK, so how do we actually test friction?

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I thought you'd never ask.

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-What exactly is this?

-I've wanted to do this for ages!

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This is the recreation of a very famous experiment that takes

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two books...

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And then it interleaves the pages together.

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You take the bottom page from this book

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-and then you put the bottom page from this book on top of it.

-Oh!

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And then a page from this and a page from this,

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kind of wrapping the pages on top of each other, interleaving them

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and you're left with that. And then they lock together like that.

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-I can't imagine how many hours that takes.

-SO long!

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For this test, we're using two chunky books, and the rubber band

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is there purely to keep the book covers from flopping about.

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It's going to take a massive force to pull it apart.

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-Yeah, but the question is, how massive?

-Ha-ha!

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Well, we need something quite a lot stronger than us, that's for sure.

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How about two vans which will drive in opposite directions to try

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and pull the books apart?

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And what I've done is I've put in this thing,

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this is called a load cell.

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What this is going to do is tell us the maximum amount of force that

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these vans are pulling on either side of this bad boy book rig.

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What's going to happen, is it going to rip,

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is it going to survive? There's only one way to find out.

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Three, two, one... Pull!

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Look at that!

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TYRES SQUEAL

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Try harder!

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That's unbelievable.

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She is smokin'!

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-Woohoo!

-Let's see what happened.

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-Let's go in, are we good?

-Is it safe? Yeah.

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We're coming in, guys!

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-I can't believe this didn't break.

-1,167kg.

-So what does that mean?

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That is like hanging 18 adults off this book rig. But you know what?

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-I think we can take this bigger.

-What do you mean?

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To be honest, you really do not want to know.

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Greg has a super-sized experiment that will really test these

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books, and it's all going to take place at the home of Blue Peter,

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at Media City in Salford.

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-So, Greg, we've built our own mini Media City here.

-Yep.

-Why?

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My plan is I want to dangle you underneath those interweaved books.

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Attach the other end to a zip wire, OK, so this is you here,

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and then send you 235 metres down a zip wire,

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all the way down into the piazza, dangling using nothing but friction.

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-Is this a joke, are you joking?

-No.

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I actually can't get my head around that.

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This is a proper, proper Blue Peter challenge,

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it doesn't get more extreme than this.

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This challenge is so big, we need another presenter,

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someone with nerves of steel, and a matching suit, we need Radzi.

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As we get into position, 35 metres up, it all becomes sickeningly real.

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I didn't think it was that high.

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And now that we're up here, looking down to where I need to go,

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-oh, my tummy just went.

-That's a long way.

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My tummy just went. I feel a bit sick. I'm not going to look...

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I'm just going to look... I'm going to look this way.

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-Do you want to step over here, then?

-No, I don't.

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Come on, it's not as bad as you're making out, you know that.

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-You ready to go? You look ready to me.

-No. Oh!

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No, no, No, I feel really scared! Do I... What do...

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I'll keep my arm here a minute, so you come and shuffle up to my arm.

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Why are we trusting a book to get me to the other... Ugh!

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I've just looked over again...

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Here we go, here we go, here we go!

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-Five...

-Four...

-Three...

-Two...

-One!

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Go!

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SHE SCREAMS

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It's just the friction between those pages!

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I'm going so fast!

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-I cannot believe that worked!

-How was it, Linds?

-I'm crying!

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Get me off, get me off!

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-It worked!

-Mate, that was amazing.

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You know what, the speed really picked up.

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About halfway through, that went from being fine to actually,

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how am I going to stop?

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The whole way I was like, "Come on, science! Come on, friction!"

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I wasn't nervous at all watching Lindsey.

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But now I know that I'm using the same books that she used

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and the weather's getting worse and it's raining...

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Well, think about what normally happens when paper gets wet.

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-It gets all soggy and mushy.

-Yeah, and it tears easily!

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Yep. I don't think it's going to be able to take as much load on it

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-as soon as it gets wet.

-Oh, don't say that, Greg.

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Come on, come on, Radz... I think he's near.

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I'm going to do it! Wish me luck.

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So will two soggy books hold Radzi's weight for 235 metres

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at speeds of over 25mph?

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Cue the countdown.

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-Five...

-Four...

-Three...

-Two...

-One!

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Woohoo!

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The harness seems to work!

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-Hey!

-Greg, you're right! It works!

-Science works!

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Join in every Thursday on CBBC!

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Lindsey and Radzi are joined by science expert Greg Foot to test the power of friction with an incredible zipwire challenge.