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This is Blue Peter, but mini. | 0:00:05 | 0:00:08 | |
Expect epic adventures, mates, bakes, badges, pets, | 0:00:08 | 0:00:13 | |
presenters and your post. | 0:00:13 | 0:00:15 | |
We've only got five minutes, so get ready for your Blue Peter adventure. | 0:00:15 | 0:00:18 | |
We're in a top secret facility | 0:00:22 | 0:00:24 | |
because I'm taking on a very special challenge. | 0:00:24 | 0:00:27 | |
We're putting the laws of physics to the test. | 0:00:27 | 0:00:31 | |
We're going to be taking on one of its most famous forces to | 0:00:31 | 0:00:34 | |
push science to the limit. | 0:00:34 | 0:00:37 | |
This is Mission Friction. | 0:00:37 | 0:00:40 | |
This year the BBC launched Terrific Scientific, which is | 0:00:40 | 0:00:43 | |
all about getting us excited by science. | 0:00:43 | 0:00:46 | |
We wanted to get involved in the biggest way possible, so I've called | 0:00:46 | 0:00:50 | |
upon science expert Greg Foot to help us test the powers of friction. | 0:00:50 | 0:00:55 | |
Greg, I'm so glad you're here to help out. | 0:00:57 | 0:00:59 | |
Firstly, please tell me - what exactly is friction? | 0:00:59 | 0:01:01 | |
Right, so whenever you take two objects and they touch | 0:01:01 | 0:01:04 | |
-or they rub together, you get a force of friction between them. -OK. | 0:01:04 | 0:01:08 | |
-Try this. Rub your hands together. -Yeah. -What do you feel? | 0:01:08 | 0:01:11 | |
They're getting hot. | 0:01:11 | 0:01:12 | |
Yeah, exactly, | 0:01:12 | 0:01:13 | |
so you're having to put in energy to overcome that friction, and some of | 0:01:13 | 0:01:16 | |
that energy is getting transferred into heat, which you can feel. | 0:01:16 | 0:01:20 | |
OK, so how do we actually test friction? | 0:01:20 | 0:01:23 | |
I thought you'd never ask. | 0:01:23 | 0:01:26 | |
-What exactly is this? -I've wanted to do this for ages! | 0:01:26 | 0:01:28 | |
This is the recreation of a very famous experiment that takes | 0:01:28 | 0:01:32 | |
two books... | 0:01:32 | 0:01:33 | |
And then it interleaves the pages together. | 0:01:33 | 0:01:36 | |
You take the bottom page from this book | 0:01:36 | 0:01:37 | |
-and then you put the bottom page from this book on top of it. -Oh! | 0:01:37 | 0:01:40 | |
And then a page from this and a page from this, | 0:01:40 | 0:01:41 | |
kind of wrapping the pages on top of each other, interleaving them | 0:01:41 | 0:01:44 | |
and you're left with that. And then they lock together like that. | 0:01:44 | 0:01:47 | |
-I can't imagine how many hours that takes. -SO long! | 0:01:47 | 0:01:50 | |
For this test, we're using two chunky books, and the rubber band | 0:01:50 | 0:01:54 | |
is there purely to keep the book covers from flopping about. | 0:01:54 | 0:01:58 | |
It's going to take a massive force to pull it apart. | 0:01:58 | 0:02:00 | |
-Yeah, but the question is, how massive? -Ha-ha! | 0:02:00 | 0:02:02 | |
Well, we need something quite a lot stronger than us, that's for sure. | 0:02:02 | 0:02:06 | |
How about two vans which will drive in opposite directions to try | 0:02:06 | 0:02:10 | |
and pull the books apart? | 0:02:10 | 0:02:12 | |
And what I've done is I've put in this thing, | 0:02:12 | 0:02:14 | |
this is called a load cell. | 0:02:14 | 0:02:16 | |
What this is going to do is tell us the maximum amount of force that | 0:02:16 | 0:02:19 | |
these vans are pulling on either side of this bad boy book rig. | 0:02:19 | 0:02:23 | |
What's going to happen, is it going to rip, | 0:02:23 | 0:02:25 | |
is it going to survive? There's only one way to find out. | 0:02:25 | 0:02:28 | |
Three, two, one... Pull! | 0:02:28 | 0:02:32 | |
Look at that! | 0:02:35 | 0:02:36 | |
TYRES SQUEAL | 0:02:36 | 0:02:37 | |
Try harder! | 0:02:37 | 0:02:39 | |
That's unbelievable. | 0:02:39 | 0:02:40 | |
She is smokin'! | 0:02:42 | 0:02:43 | |
-Woohoo! -Let's see what happened. | 0:02:43 | 0:02:45 | |
-Let's go in, are we good? -Is it safe? Yeah. | 0:02:45 | 0:02:47 | |
We're coming in, guys! | 0:02:47 | 0:02:48 | |
-I can't believe this didn't break. -1,167kg. -So what does that mean? | 0:02:48 | 0:02:53 | |
That is like hanging 18 adults off this book rig. But you know what? | 0:02:53 | 0:03:00 | |
-I think we can take this bigger. -What do you mean? | 0:03:00 | 0:03:03 | |
To be honest, you really do not want to know. | 0:03:03 | 0:03:05 | |
Greg has a super-sized experiment that will really test these | 0:03:10 | 0:03:14 | |
books, and it's all going to take place at the home of Blue Peter, | 0:03:14 | 0:03:18 | |
at Media City in Salford. | 0:03:18 | 0:03:21 | |
-So, Greg, we've built our own mini Media City here. -Yep. -Why? | 0:03:21 | 0:03:27 | |
My plan is I want to dangle you underneath those interweaved books. | 0:03:27 | 0:03:34 | |
Attach the other end to a zip wire, OK, so this is you here, | 0:03:34 | 0:03:40 | |
and then send you 235 metres down a zip wire, | 0:03:40 | 0:03:45 | |
all the way down into the piazza, dangling using nothing but friction. | 0:03:45 | 0:03:52 | |
-Is this a joke, are you joking? -No. | 0:03:52 | 0:03:54 | |
I actually can't get my head around that. | 0:03:55 | 0:03:58 | |
This is a proper, proper Blue Peter challenge, | 0:03:58 | 0:04:01 | |
it doesn't get more extreme than this. | 0:04:01 | 0:04:03 | |
This challenge is so big, we need another presenter, | 0:04:03 | 0:04:07 | |
someone with nerves of steel, and a matching suit, we need Radzi. | 0:04:07 | 0:04:12 | |
As we get into position, 35 metres up, it all becomes sickeningly real. | 0:04:15 | 0:04:20 | |
I didn't think it was that high. | 0:04:20 | 0:04:22 | |
And now that we're up here, looking down to where I need to go, | 0:04:22 | 0:04:25 | |
-oh, my tummy just went. -That's a long way. | 0:04:25 | 0:04:27 | |
My tummy just went. I feel a bit sick. I'm not going to look... | 0:04:27 | 0:04:30 | |
I'm just going to look... I'm going to look this way. | 0:04:30 | 0:04:32 | |
-Do you want to step over here, then? -No, I don't. | 0:04:32 | 0:04:34 | |
Come on, it's not as bad as you're making out, you know that. | 0:04:34 | 0:04:37 | |
-You ready to go? You look ready to me. -No. Oh! | 0:04:42 | 0:04:45 | |
No, no, No, I feel really scared! Do I... What do... | 0:04:45 | 0:04:48 | |
I'll keep my arm here a minute, so you come and shuffle up to my arm. | 0:04:48 | 0:04:51 | |
Why are we trusting a book to get me to the other... Ugh! | 0:04:51 | 0:04:53 | |
I've just looked over again... | 0:04:53 | 0:04:56 | |
Here we go, here we go, here we go! | 0:04:56 | 0:04:57 | |
-Five... -Four... -Three... -Two... -One! | 0:04:57 | 0:05:01 | |
Go! | 0:05:01 | 0:05:03 | |
SHE SCREAMS | 0:05:04 | 0:05:06 | |
It's just the friction between those pages! | 0:05:07 | 0:05:10 | |
I'm going so fast! | 0:05:11 | 0:05:13 | |
-I cannot believe that worked! -How was it, Linds? -I'm crying! | 0:05:17 | 0:05:21 | |
Get me off, get me off! | 0:05:22 | 0:05:24 | |
-It worked! -Mate, that was amazing. | 0:05:24 | 0:05:26 | |
You know what, the speed really picked up. | 0:05:26 | 0:05:29 | |
About halfway through, that went from being fine to actually, | 0:05:29 | 0:05:33 | |
how am I going to stop? | 0:05:33 | 0:05:34 | |
The whole way I was like, "Come on, science! Come on, friction!" | 0:05:35 | 0:05:39 | |
I wasn't nervous at all watching Lindsey. | 0:05:39 | 0:05:41 | |
But now I know that I'm using the same books that she used | 0:05:41 | 0:05:45 | |
and the weather's getting worse and it's raining... | 0:05:45 | 0:05:48 | |
Well, think about what normally happens when paper gets wet. | 0:05:48 | 0:05:51 | |
-It gets all soggy and mushy. -Yeah, and it tears easily! | 0:05:51 | 0:05:54 | |
Yep. I don't think it's going to be able to take as much load on it | 0:05:54 | 0:05:57 | |
-as soon as it gets wet. -Oh, don't say that, Greg. | 0:05:57 | 0:05:59 | |
Come on, come on, Radz... I think he's near. | 0:05:59 | 0:06:01 | |
I'm going to do it! Wish me luck. | 0:06:01 | 0:06:04 | |
So will two soggy books hold Radzi's weight for 235 metres | 0:06:05 | 0:06:10 | |
at speeds of over 25mph? | 0:06:10 | 0:06:12 | |
Cue the countdown. | 0:06:12 | 0:06:14 | |
-Five... -Four... -Three... -Two... -One! | 0:06:14 | 0:06:20 | |
Woohoo! | 0:06:20 | 0:06:23 | |
The harness seems to work! | 0:06:31 | 0:06:35 | |
-Hey! -Greg, you're right! It works! -Science works! | 0:06:41 | 0:06:45 | |
Join in every Thursday on CBBC! | 0:06:48 | 0:06:51 |