0:00:06 > 0:00:08# If you've got a question and you don't know where to go
0:00:08 > 0:00:11# Ask Nina for some help Cos she's got a science show
0:00:11 > 0:00:14# She makes sense of her senses While helping all her fans
0:00:14 > 0:00:17# By doing her experiments with potions and with bangs
0:00:17 > 0:00:20- # Touch your tongue - Tongue
0:00:20 > 0:00:21- # Fingers - Fingers
0:00:21 > 0:00:23- # Eyes, eyes - Ears, ears
0:00:23 > 0:00:24- # Nose - Nose
0:00:24 > 0:00:26# Nina and the Neurons find out what you need to know
0:00:26 > 0:00:30# Nina and the Neurons find out what you need to know
0:00:30 > 0:00:32# Luke, he helps us with our eyes and Felix with our touch
0:00:32 > 0:00:36# Ollie sniffs out smells and scents And Belle she hears so much
0:00:36 > 0:00:39# Bud is Ollie's brother He helps us with our taste
0:00:39 > 0:00:41# They're Nina's little Neurons and they're coming to your place
0:00:41 > 0:00:43- # Touch your tongue - Tongue
0:00:43 > 0:00:45- # Fingers - Fingers
0:00:45 > 0:00:46- # Eyes, eyes - Ears, ears
0:00:46 > 0:00:48- # Nose - Nose
0:00:48 > 0:00:51# Nina and the Neurons find out what you need to know, yeah!
0:00:51 > 0:00:53# Nina and the Neurons find out what you need to know
0:00:53 > 0:00:55# Oh, yeah! #
0:00:57 > 0:01:02Oh, hello. Wow, I was so relaxed I almost fell asleep there.
0:01:02 > 0:01:06It's quite hot in the lab today, so I'm using my fan to keep me cool.
0:01:06 > 0:01:08BEEPING
0:01:08 > 0:01:13Oh, I hear a beep, I see a flash, I wonder what they're going to ask.
0:01:17 > 0:01:21- Hi, Nina!- Hi.- We've got a question for you.
0:01:21 > 0:01:27Why does it feel like it's windy when we go fast on our bikes?
0:01:27 > 0:01:28That's a great question.
0:01:28 > 0:01:32Why does it feel like it's windy when we go fast on our bikes?
0:01:32 > 0:01:33When we're cycling,
0:01:33 > 0:01:37air whooshes all around us and it can feel really windy.
0:01:37 > 0:01:40Why don't you come to my lab and investigate?
0:01:40 > 0:01:44- See you soon, Nina. Bye!- Bye.
0:01:44 > 0:01:47I'm going to need some help to answer this one
0:01:47 > 0:01:50and I know just who to ask. OK, Neurons, time to get to work!
0:02:06 > 0:02:08ALL: Neurons at the ready, Nina.
0:02:08 > 0:02:10OK. Today's question is -
0:02:10 > 0:02:14why does it feel like it's windy when we go fast on our bikes?
0:02:14 > 0:02:18Which Neuron will be most useful in helping us find the answer?
0:02:18 > 0:02:20ALL: Me! Me! Me! Oh, me!
0:02:20 > 0:02:23Will it be fabulous Felix?
0:02:23 > 0:02:27I can help so very much if you need the sense of touch.
0:02:27 > 0:02:29Will it be beautiful Belle?
0:02:29 > 0:02:33I send messages to brain from ear. If there's a sound, I'll help you hear.
0:02:33 > 0:02:35Will it be lovely Luke?
0:02:35 > 0:02:37For looking and seeing, day or night,
0:02:37 > 0:02:40I'll help you with your sense of sight.
0:02:40 > 0:02:42Will it be awesome Ollie?
0:02:42 > 0:02:44If it's pongy or whiffy but you can't tell,
0:02:44 > 0:02:48- my messages help your sense of smell. - Or will it be baby Bud?
0:02:48 > 0:02:53Sour, salty, bitter or sweet, I'm your taste buddy whenever you eat!
0:02:56 > 0:02:57It's Felix!
0:02:59 > 0:03:06CHANTING: Go, Felix! Go, Felix!
0:03:06 > 0:03:11Marvellous! A little touch can mean so much, Nina.
0:03:11 > 0:03:12Today's question is -
0:03:12 > 0:03:15why does it feel like it's windy when we go fast on our bikes?
0:03:15 > 0:03:19Because when we cycle we can feel the air around us,
0:03:19 > 0:03:21Felix, our touch Neuron, will be helping us!
0:03:21 > 0:03:26Right, I need to get the lab ready before the experimenters arrive.
0:03:26 > 0:03:28Lennon likes going to Boys' Brigade.
0:03:28 > 0:03:31Charlotte loves learning new things.
0:03:31 > 0:03:33I like cycling.
0:03:33 > 0:03:34It's fun going fast.
0:03:34 > 0:03:36They both want to know -
0:03:36 > 0:03:40why does it feel like it's windy when we go fast on our bikes?
0:03:40 > 0:03:41So today, for one day only,
0:03:41 > 0:03:44Charlotte and Lennon become the experimenters.
0:03:49 > 0:03:51- Hi, guys!- Hi, Nina.
0:03:51 > 0:03:54Welcome to my lab and thanks for your great question -
0:03:54 > 0:03:58why does it feel like it's windy when we go fast on our bikes?
0:03:58 > 0:04:01To find out the answer, let's start by using our senses.
0:04:01 > 0:04:06ALL: Whoop-whoo! A senses experiment! We're ready, Nina.
0:04:06 > 0:04:09First we're going to use our sense of touch.
0:04:09 > 0:04:13So let's try moving our arms through the air like this. Copy me.
0:04:15 > 0:04:19Up and down. Now what can you feel in your hands?
0:04:19 > 0:04:21I can feel the air moving a little.
0:04:21 > 0:04:26Yes, when we move our hands slowly, we can feel the air a little bit.
0:04:26 > 0:04:29But what happens if we speed up?
0:04:29 > 0:04:31Ha-ha-ha!
0:04:31 > 0:04:33Nina's flapping like a bird.
0:04:33 > 0:04:35How does it feel now?
0:04:35 > 0:04:37It feels really windy.
0:04:37 > 0:04:38Yes, stop there.
0:04:38 > 0:04:40Oh.
0:04:40 > 0:04:42So even though we can't see air,
0:04:42 > 0:04:45we could definitely feel it blowing past our hands -
0:04:45 > 0:04:48a bit like how it feels when we're on a bicycle.
0:04:48 > 0:04:52The faster we move, the more we feel it.
0:04:52 > 0:04:55It's all because we moved through the air
0:04:55 > 0:04:58and the next experiment will help to explain.
0:04:58 > 0:05:02So, we're going to pretend these plastic balls
0:05:02 > 0:05:04are the air all around us.
0:05:04 > 0:05:09First, I would like you guys to move through the air, nice and slowly.
0:05:09 > 0:05:12So, Lennon, why don't you go first?
0:05:14 > 0:05:15Stop!
0:05:15 > 0:05:16Out you come.
0:05:18 > 0:05:21OK, Charlotte, off you go, nice and slowly.
0:05:21 > 0:05:23And stop! Out you come.
0:05:25 > 0:05:28So, how much of the air did you push through?
0:05:28 > 0:05:30We only went halfway, Nina.
0:05:30 > 0:05:32And could you feel the air?
0:05:32 > 0:05:33A little bit.
0:05:33 > 0:05:35Well, let's do it again
0:05:35 > 0:05:39but this time I would like you to walk through the air much faster.
0:05:39 > 0:05:40OK?
0:05:41 > 0:05:42And stop!
0:05:45 > 0:05:46Stop!
0:05:46 > 0:05:49And how did the air feel this time?
0:05:49 > 0:05:51We could feel it much more, Nina.
0:05:51 > 0:05:52Yes.
0:05:52 > 0:05:56When we move, our bodies push the air out of the way
0:05:56 > 0:05:59and when we move fast, like when we're cycling,
0:05:59 > 0:06:00we push through much more air.
0:06:00 > 0:06:04So that's when we really start to feel it moving past us.
0:06:04 > 0:06:07Now, a breeze when we're cycling could be lovely
0:06:07 > 0:06:11but for cyclists covering a long distance or in a race,
0:06:11 > 0:06:12all that air can be a problem.
0:06:12 > 0:06:16To find out more, we're going to visit somewhere very exciting
0:06:16 > 0:06:19where there's a real need for speed.
0:06:21 > 0:06:26Oh, goodie! I love this bit. I wonder where Nina is taking us.
0:06:26 > 0:06:29Nina said it's somewhere with a need for speed.
0:06:29 > 0:06:32Maybe it's an airport. Aeroplanes are speedy.
0:06:32 > 0:06:34Oh, I love aeroplanes!
0:06:34 > 0:06:36Nee-ow!
0:06:36 > 0:06:39We've arrived, but I don't see any jumbo jets.
0:06:41 > 0:06:44We've come to this amazing place and it's called a velodrome.
0:06:44 > 0:06:48Velodromes are designed for cyclists to go really fast,
0:06:48 > 0:06:50so let's watch.
0:07:00 > 0:07:02- Hi, Graham.- Hi, guys.
0:07:02 > 0:07:05Graham, you were cycling really fast there.
0:07:05 > 0:07:08How did you do that with the windy air pushing against you?
0:07:08 > 0:07:10This bike is specially designed.
0:07:10 > 0:07:13It doesn't weigh much. These special handlebars
0:07:13 > 0:07:16allow me to tuck in as close to the bike as possible.
0:07:16 > 0:07:18Why does he make that shape, Nina?
0:07:18 > 0:07:22Good question, Felix. Let's do an experiment to find out.
0:07:22 > 0:07:27Now, Graham, we'll time you cycling one lap when you're sitting upright
0:07:27 > 0:07:29and another lap when you're tucked in
0:07:29 > 0:07:31and we'll see what happens.
0:07:31 > 0:07:34Three! Two! One!
0:07:34 > 0:07:35Go!
0:07:44 > 0:07:47Listen to the speedy whoosh of his bike.
0:07:55 > 0:07:58Wow, the sitting-up position seemed pretty fast to me
0:07:58 > 0:08:01and it was 18 seconds.
0:08:01 > 0:08:04So Graham's got his breath back and this time
0:08:04 > 0:08:07he's going to cycle in his usual tucked-in position.
0:08:07 > 0:08:10Let's see if this makes a difference to his speed.
0:08:10 > 0:08:11So here we go!
0:08:11 > 0:08:12Go!
0:08:20 > 0:08:22Whoa! Look at him go!
0:08:29 > 0:08:32Yay! Well done, Graham!
0:08:32 > 0:08:35And that was 16 seconds.
0:08:35 > 0:08:38So, that's why cyclists crouch over their bikes.
0:08:38 > 0:08:42To make their shape small like me.
0:08:42 > 0:08:44Because the smaller the shape,
0:08:44 > 0:08:46the easier it is to move through the air.
0:08:47 > 0:08:50What do you notice about the cyclists now?
0:08:50 > 0:08:52They're cycling in a line.
0:08:52 > 0:08:54Racing cyclists are specially trained.
0:08:54 > 0:08:57You shouldn't try this yourself.
0:08:57 > 0:09:00Yes, cyclists choose to cycle close together in a line.
0:09:00 > 0:09:02But why do they do it?
0:09:02 > 0:09:06I've got an exciting experiment that will help to explain, so let's go!
0:09:08 > 0:09:10Cyclists sit in tucked-in positions
0:09:10 > 0:09:14because their smaller shapes move them faster and easier.
0:09:14 > 0:09:18But why is it important to race behind each other
0:09:18 > 0:09:19in a line like this?
0:09:19 > 0:09:23Well, let's do a fun experiment with this big fan to find out.
0:09:25 > 0:09:27Let's move our arms up in the air!
0:09:29 > 0:09:31Whoo! Whee!
0:09:32 > 0:09:34This is great!
0:09:42 > 0:09:44What did that feel like?
0:09:44 > 0:09:45It felt windy.
0:09:45 > 0:09:48It felt like being on our bikes.
0:09:48 > 0:09:52Yes, we could feel the air rushing by us, just like when we're cycling,
0:09:52 > 0:09:55so let's see what happens if we go in a line.
0:10:07 > 0:10:09What happened that time?
0:10:09 > 0:10:12We didn't feel so much air, Nina.
0:10:12 > 0:10:13That's right.
0:10:13 > 0:10:16The air wasn't pushing past you as much
0:10:16 > 0:10:18because you were standing behind me.
0:10:18 > 0:10:22I wonder if this is why cyclists race in a line.
0:10:22 > 0:10:24Let's do one final experiment to find out.
0:10:24 > 0:10:26For this experiment,
0:10:26 > 0:10:30my science helpers are pretending to be racing cyclists.
0:10:30 > 0:10:32So the fan will blow air past them
0:10:32 > 0:10:35like it would feel if they were cycling really fast.
0:10:35 > 0:10:40But what we want to know is where on their bodies the air pushes.
0:10:40 > 0:10:43So we're going to sprinkle some special powder
0:10:43 > 0:10:46in front of the fan and see where it lands.
0:10:46 > 0:10:50And we shall put on our protective masks and goggles.
0:11:10 > 0:11:13Oh, the powder is making me sneeze.
0:11:13 > 0:11:15Atishoo!
0:11:17 > 0:11:18Oh, bless you, Ollie.
0:11:18 > 0:11:22And thank you to my lovely science helpers for the cycling.
0:11:22 > 0:11:26Now, experimenters, what do you notice about the cyclists?
0:11:26 > 0:11:29They've got powder stuck to their clothes.
0:11:29 > 0:11:33That's right. Which cyclist has more powder stuck to them?
0:11:33 > 0:11:35The one at the front.
0:11:35 > 0:11:39Yes, the cyclist at the front has a lot more powder stuck to him
0:11:39 > 0:11:43and that's because there was more air pushing against him.
0:11:43 > 0:11:47- NEURON:- So the cyclist behind is less pushed by the air.
0:11:47 > 0:11:50BELLE: Which means it's easier for them to cycle.
0:11:50 > 0:11:51That's right, Belle.
0:11:51 > 0:11:54This is why cyclists choose to race in a line.
0:11:54 > 0:11:58They take it in turns to be at the front where it's harder to cycle
0:11:58 > 0:12:02but at the end of the race, they all try to get to the front to win.
0:12:02 > 0:12:05# Nina and the Neurons! #
0:12:07 > 0:12:08So, your question was -
0:12:08 > 0:12:12why does it feel like it's windy when we go fast on our bikes?
0:12:12 > 0:12:14And I think we've answered it.
0:12:14 > 0:12:16NEURON: Invisible air is all around us.
0:12:16 > 0:12:19When we move, we're pushing through the air.
0:12:19 > 0:12:24Moving faster means moving further and pushing through more air.
0:12:24 > 0:12:28Cyclists make themselves into a small shape so they go faster.
0:12:28 > 0:12:34Racing in a line means the cyclists behind are pushed by less air.
0:12:34 > 0:12:36So I hope that's answered your question.
0:12:36 > 0:12:39- Thanks, Nina. Bye!- Bye.
0:12:40 > 0:12:44If you want to know more about the science that's all around us,
0:12:44 > 0:12:48go to the Nina section on the CBeebies website. Have fun!
0:12:48 > 0:12:51On your marks, get set...
0:12:51 > 0:12:53Go!
0:12:53 > 0:12:54# Get sporty!
0:12:54 > 0:12:57# Doo-bee, doo-bee, doob, doob Doo-bee, doo
0:12:57 > 0:12:58# Get sporty!
0:12:58 > 0:13:01# Doo-bee, doo-bee, doob, doob Doo-bee, doo
0:13:01 > 0:13:04# If you're itching for some exercise from your head down to your toes
0:13:04 > 0:13:05# Toes!
0:13:05 > 0:13:09# Why not try out something new and give it a real go?
0:13:09 > 0:13:10# Go!
0:13:10 > 0:13:13# Whenever you are restless and feeling kind of bored
0:13:13 > 0:13:14# Bored!
0:13:14 > 0:13:19# Grab your friends and go outside and try a brand-new sport!
0:13:19 > 0:13:21# Oooooooh!
0:13:21 > 0:13:22# Get sporty!
0:13:22 > 0:13:25# Doo-bee, doo-bee, doob, doob Doo-bee, doo
0:13:25 > 0:13:26# Get sporty!
0:13:26 > 0:13:29# Doo-bee, doo-bee, doob, doob Doo-bee, doo
0:13:29 > 0:13:32# Spinning, throwing, running, jumping
0:13:32 > 0:13:33# Lots of fun to do!
0:13:33 > 0:13:36# Cycling, diving, sliding, rolling
0:13:36 > 0:13:37- # It's really up to you - Yoo-hoo!
0:13:37 > 0:13:42# If you're wondering how a swimmer swims or a bike can go so fast
0:13:42 > 0:13:47# Give it a bash and make it last It's time to go get sporty! #
0:13:47 > 0:13:49Oooooooh!
0:13:49 > 0:13:50# Get sporty!
0:13:50 > 0:13:53# Doo-bee, doo-bee, doob, doob Doo-bee, doo
0:13:53 > 0:13:55# Get sporty!
0:13:55 > 0:13:58# Doo-bee, doo-bee, doob, doob Doo-bee, doo. #
0:13:58 > 0:14:03And remember, whether it's inside, outside, on a bike, or in a pool,
0:14:03 > 0:14:05we can all try something new and get sporty.
0:14:05 > 0:14:07See you again soon, bye!
0:14:07 > 0:14:09ALL: Bye-bye!
0:14:09 > 0:14:11Get Sporty!