0:00:06 > 0:00:08# If you've got a question And you don't know where to go
0:00:08 > 0:00:12# Ask Nina for some help Cos she's got a science show
0:00:12 > 0:00:15# She makes sense of her senses While helping all her fans
0:00:15 > 0:00:17# By doing her experiments With potions and with bangs
0:00:17 > 0:00:19- # Touch your tongue - Tongue
0:00:19 > 0:00:20- # Fingers - Fingers
0:00:20 > 0:00:22- # Eyes Eyes - Ears Ears
0:00:22 > 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 > 0:00:29# Nina and the Neurons Find out what you need to know
0:00:29 > 0:00:32# Luke he helps us with our eyes And Felix with our touch
0:00:32 > 0:00:35# Ollie sniffs out smells and scents And Belle she hears so much
0:00:35 > 0:00:38# Bud is Ollie's brother He helps us with our taste
0:00:38 > 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 > 0:00:44- # Fingers - Fingers
0:00:44 > 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 > 0:00:54# Nina and the Neurons find out what you need to know
0:00:54 > 0:00:55# Oh, yeah! #
0:00:56 > 0:01:00La-la-la-la-la-la-la-la.
0:01:00 > 0:01:05Oh! Hello, there. I'm just having a dance with my broom.
0:01:05 > 0:01:09Better get back to sweeping the floor, ha-ha.
0:01:09 > 0:01:10BEEP, BEEP
0:01:10 > 0:01:14- Oh, I hear a beep.- I see a flash. I wonder what they're going to ask?
0:01:19 > 0:01:21BOTH: Hi, Nina!
0:01:21 > 0:01:25- Hi.- We've got a question for you.
0:01:25 > 0:01:29- Why do they sweep the ice in curling?- That's a great question.
0:01:29 > 0:01:32Why do they sweep the ice in curling?
0:01:32 > 0:01:35Well, curling is a type of sport that's played on ice
0:01:35 > 0:01:38and they always sweep the ice when they play.
0:01:38 > 0:01:41Why don't you come down my lab and we'll investigate?
0:01:41 > 0:01:43BOTH: See you soon, Nina. Bye!
0:01:43 > 0:01:47Bye. Well, I'm going to need some help to answer this one
0:01:47 > 0:01:48and I know just who to ask.
0:01:48 > 0:01:51OK, Neurons, time to get to work.
0:02:06 > 0:02:09ALL: Neurons at the ready, Nina.
0:02:09 > 0:02:13OK. Today's question is who do they sweep the ice in curling?
0:02:13 > 0:02:16Which Neuron will be most useful in helping us find the answer?
0:02:16 > 0:02:20ALL: Me! Me! Me! Oh, me!
0:02:20 > 0:02:22Will it be fabulous Felix?
0:02:22 > 0:02:26I can help so very much if you need the sense of touch.
0:02:26 > 0:02:28Will it be beautiful Belle?
0:02:28 > 0:02:32I send messages to brain from ear. If there's a sound, I'll help you hear.
0:02:32 > 0:02:34Will it be lovely Luke?
0:02:34 > 0:02:38For looking and seeing, day or night, I'll help you with
0:02:38 > 0:02:40your sense of sight.
0:02:40 > 0:02:42Will it be awesome Ollie?
0:02:42 > 0:02:45If it's pongy or whiffy but you can't tell, my messages help
0:02:45 > 0:02:48- your sense of smell. - Or will it be baby Bud?
0:02:48 > 0:02:51Sour, salty, bitter or sweet,
0:02:51 > 0:02:53I'm your taste buddy whenever you eat!
0:02:57 > 0:02:58Belle!
0:02:58 > 0:03:03ALL: Go, Belle! Go, Belle! Go, Belle!
0:03:06 > 0:03:09Brilliant! I'm all ears, Nina.
0:03:09 > 0:03:12Today's question is, why do they sweep the ice in curling?
0:03:12 > 0:03:15Because there are lots of brilliant sweeping
0:03:15 > 0:03:20and swishing sounds in curling, Belle will be helping us today.
0:03:20 > 0:03:21But, stand by Neurons,
0:03:21 > 0:03:24I have a feeling I may need help from all of you.
0:03:24 > 0:03:28I need to get the Lab ready before the experimenters arrive.
0:03:28 > 0:03:33Marsook loves eating Uyghur Polo. Emily loves practising guitar.
0:03:33 > 0:03:37- I saw curling on the TV. - Sweeping the ice looks fun.
0:03:37 > 0:03:41But, they both want to know, why do they sweep the ice in curling?
0:03:41 > 0:03:43So today, for one day only,
0:03:43 > 0:03:46Marsook and Emily become...the experimenters!
0:03:52 > 0:03:54- Hi, guys!- Hi, Nina!
0:03:54 > 0:03:57Welcome to my lab, and thank you for your great question.
0:03:57 > 0:04:00Why do they sweep the ice in curling?
0:04:00 > 0:04:03To find out the answer, let's start by using our senses.
0:04:03 > 0:04:08ALL: Whoop whoo! A senses experiment. We're ready, Nina.
0:04:08 > 0:04:12First of all, let's have a look at what curling actually is.
0:04:12 > 0:04:15- Oh, it looks fun, doesn't it?- Yes.
0:04:15 > 0:04:18Now, curling is a sport that's played on ice.
0:04:18 > 0:04:21And teams of curlers have to work together to try
0:04:21 > 0:04:24and slide special stones onto a target.
0:04:24 > 0:04:27The winning stone is the one that's nearest
0:04:27 > 0:04:30the middle of the target at the end of the game.
0:04:30 > 0:04:34- Now, can you see the curlers sweeping the ice?- Yes.- Yeah.
0:04:34 > 0:04:35So, why do they do that?
0:04:35 > 0:04:40To help us find out, let's find out more about how things slide.
0:04:41 > 0:04:45Sliding?! Yippee! I love sliding.
0:04:46 > 0:04:50We are going to play a game with these little cups.
0:04:50 > 0:04:54You guys are going to try and push them and we'll see how far they go.
0:04:54 > 0:04:55OK?
0:04:55 > 0:05:02- Are you ready?!- Yes!- Excellent. One, two, three...push!
0:05:02 > 0:05:05Whoo. There they go.
0:05:05 > 0:05:08Hey, the cups went really quite far, didn't they?
0:05:08 > 0:05:11Yours has went to about the middle of the purple and,
0:05:11 > 0:05:15Marsook, yours has nearly got onto the yellow. Very good indeed.
0:05:15 > 0:05:21Now, the surface of the lanes, were they wet or dry? Have a feel.
0:05:21 > 0:05:25- Now, is it wet or dry?- Dry.- It's dry.
0:05:25 > 0:05:29Hmm, so I wonder what would happen if the lanes were wet?
0:05:29 > 0:05:31So, let's wet them with water.
0:05:31 > 0:05:35These bottles are safe for us to use in this experiment
0:05:35 > 0:05:37because we know there is only water in them.
0:05:37 > 0:05:41Always check with a grown-up before you spray bottles.
0:05:41 > 0:05:45There you go. And one for you and one for me. Let's get spraying.
0:05:53 > 0:05:59Oh, no, not water. Why do Nina's experiments have to be so messy?
0:05:59 > 0:06:00Thank you very much.
0:06:00 > 0:06:06OK, now, I'd like you to push these cups just like you did before.
0:06:06 > 0:06:08One, two, three...push!
0:06:09 > 0:06:11Oh, wow, it's gone right to the top and yours
0:06:11 > 0:06:13got into the yellow.
0:06:13 > 0:06:16They definitely went further this time.
0:06:16 > 0:06:18Because water can make a surface more slippy
0:06:18 > 0:06:21and that helps the cups to slide for longer.
0:06:21 > 0:06:25So maybe this is how curlers can slide their stones so far?
0:06:25 > 0:06:26Maybe it is, Ollie.
0:06:26 > 0:06:30Let's get out of the lab and go somewhere cold to find out.
0:06:34 > 0:06:38Hmm, where do you think we're going today?
0:06:38 > 0:06:43- Nina said it was somewhere cold. - I hope there's loads of snow!
0:06:43 > 0:06:46I do hope Nina has remembered to bring some warm clothes.
0:06:46 > 0:06:49Well, you can stop guessing. We're here.
0:06:51 > 0:06:55So, you asked why do they sweep the ice in curling.
0:06:55 > 0:06:58To find out, let's watch some really good curlers in action.
0:07:11 > 0:07:16Oh, listen to that swishing noise as they sweep the ice! Ho-ho-ho-ho.
0:07:16 > 0:07:21Aw, it must be really dirty to have to sweep it that much.
0:07:23 > 0:07:25That's not why they do it, Bud.
0:07:25 > 0:07:27Let's do an experiment to find out why.
0:07:27 > 0:07:31OK, everyone, let's rub our hands together, gently.
0:07:31 > 0:07:34Gently, gently, yeah, that's good.
0:07:34 > 0:07:36Now, let's do it faster!
0:07:37 > 0:07:39Heh-heh-heh-heh.
0:07:39 > 0:07:41ALL: Ha-ha-ha.
0:07:41 > 0:07:44- What's happening? - Our hands are getting warmer.
0:07:44 > 0:07:48Yes, as we rub our hands together they're getting warmer.
0:07:48 > 0:07:52And that's because rubbing two things together creates heat.
0:07:52 > 0:07:54And that's what the curlers are doing
0:07:54 > 0:07:58when they rub the top of the ice with their brooms.
0:07:58 > 0:08:00They're creating a little bit of heat.
0:08:00 > 0:08:03They're not doing a very good job. It's freezing.
0:08:03 > 0:08:07Nina did say, "a little bit of heat," Felix.
0:08:07 > 0:08:10But, what does a little bit of heat do to the ice?
0:08:10 > 0:08:14Well, let's hold an ice cube in our hand for a few seconds
0:08:14 > 0:08:15and we'll see.
0:08:15 > 0:08:20So, hold it in your hand. Now, let's rub it into our hands like this.
0:08:20 > 0:08:26- Yeah, that's it, whoo! Now, what's happening?- They're melting.
0:08:26 > 0:08:30Yes, oh, the ice is melting because of the heat from our hands.
0:08:30 > 0:08:32So, ice is frozen water
0:08:32 > 0:08:35and when it melts it turns back into water again.
0:08:35 > 0:08:38Like the water that we've got in our hands.
0:08:38 > 0:08:41The same thing happens with the ice here, too.
0:08:41 > 0:08:44The heat created by the sweeping makes
0:08:44 > 0:08:50the ice in front of the stone melt and makes a tiny layer of water.
0:08:50 > 0:08:52The wet surface is more slippy
0:08:52 > 0:08:54and this helps the stones to slide further.
0:08:54 > 0:08:59Just like we saw in our experiment in my lab earlier.
0:08:59 > 0:09:02So, the main reason for sweeping the ice isn't to clean it.
0:09:02 > 0:09:06It's so the ice heats up and melts!
0:09:06 > 0:09:09The heat melts the top of the ice and makes a layer of water.
0:09:09 > 0:09:13And the water helps the stone to slide along further.
0:09:13 > 0:09:16I couldn't have put it better myself, Neurons.
0:09:16 > 0:09:20But, if it's really slippy, why don't the curlers fall over?
0:09:20 > 0:09:24That's a great question. It's time for another experiment.
0:09:25 > 0:09:28Now, we are going to see how slippy different
0:09:28 > 0:09:32materials are on the ice using these sledges.
0:09:32 > 0:09:35The blue one has rubber on the bottom
0:09:35 > 0:09:38and the red one doesn't, it's just plastic.
0:09:38 > 0:09:40So, let's try moving them on the ice
0:09:40 > 0:09:43and we'll see which one slides better.
0:09:44 > 0:09:49- OK, are you ready to slide?- Yeah!
0:09:49 > 0:09:52Oh-ho-ho-ho, OK, and I'll give you both the same push.
0:09:52 > 0:09:54OK, Marsook, you're first.
0:10:03 > 0:10:05Ha-ha-ha.
0:10:05 > 0:10:13Ho-ho! Sliding on the ice is cool! Get it? Ice. Cool. Ha-ha!
0:10:15 > 0:10:18- Ah, that was great fun, wasn't it? - Yeah!- He-he!
0:10:18 > 0:10:23- Now, which one do you think was slidier?- That one.
0:10:23 > 0:10:24The red one, that's right,
0:10:24 > 0:10:28and that's because the red one has a plastic bottom.
0:10:28 > 0:10:30Which is a slippy material.
0:10:30 > 0:10:34But, the blue one has rubber on the bottom which isn't as slippy.
0:10:34 > 0:10:38And that's why rubber is used at the bottom of lots of shoes,
0:10:38 > 0:10:39to help them grip.
0:10:39 > 0:10:45But, we saw the curlers sliding and stopping on the ice, Nina.
0:10:45 > 0:10:46How do they do that?
0:10:46 > 0:10:49Very well spotted, Luke.
0:10:49 > 0:10:53Curlers need to slide and stop when they're playing on the ice.
0:10:53 > 0:10:56So, they have special shoes.
0:10:56 > 0:10:59This is Fiona, one of our curlers from earlier. Hi, Fiona.
0:10:59 > 0:11:02- Hi, everyone.- ALL: Hi, Fiona.
0:11:02 > 0:11:06These shoes are like Fiona's.
0:11:06 > 0:11:10One of them has a smooth, special, plastic bottom for sliding
0:11:10 > 0:11:14and the other one has a rubber bottom for stopping.
0:11:14 > 0:11:18- So, Fiona, can you show us how you move and stop on the ice?- Sure.
0:11:28 > 0:11:32Oh, so that's how the curlers move around the ice safely.
0:11:32 > 0:11:35They wear special shoes.
0:11:35 > 0:11:39Two different shoes, one with a rubber bottom to help them
0:11:39 > 0:11:44grip the ice and one with a plastic bottom to help them slide along.
0:11:44 > 0:11:48That's right, Neurons. Thank you, Fiona, that was brilliant.
0:11:54 > 0:11:58So, your question was why do they sweep the ice in curling?
0:11:58 > 0:11:59And I think we've answered it.
0:11:59 > 0:12:04We found out that curling stones slide faster on a wet surface.
0:12:04 > 0:12:10- Weeeehehehe!- And that rubbing two things together makes heat.
0:12:10 > 0:12:15In curling, the sweepers rub the ice to make it hotter so it melts
0:12:15 > 0:12:17and it's slippier for the stones.
0:12:17 > 0:12:22- So, I hope that's answered your question.- BOTH: Thanks, Nina. Bye!
0:12:22 > 0:12:24You're welcome, bye.
0:12:26 > 0:12:29If you want to know more about the science that's all around us
0:12:29 > 0:12:33go to the Nina section on the CBeebies website. Have fun.
0:12:33 > 0:12:37On your marks, get set...go!
0:12:37 > 0:12:42# Get sporty Doob-e-doob-e-doob-doob-doob-e-do-do
0:12:42 > 0:12:45# Get sporty Doob-e-doob-e-doob-doob-doob-e-do-do
0:12:45 > 0:12:48# If you're itching for some exercise
0:12:48 > 0:12:50- # From your head down to your toes - Toes!
0:12:50 > 0:12:54# Why not try at something new and Give it a real go
0:12:54 > 0:12:58# Whenever you are restless And feeling kind bored
0:12:58 > 0:12:59# Bored
0:12:59 > 0:13:04# Grab your friends and go outside And try a brand-new sport
0:13:05 > 0:13:10# Get sporty Doob-e-doob-e-doob-doob-doob-e-do-do
0:13:10 > 0:13:14# Get sporty Doob-e-doob-e-doob-doob-doob-e-do-do
0:13:14 > 0:13:16# Spinning, throwing, running, jumping
0:13:16 > 0:13:20# Lots of fun to do Cycling diving sliding rolling
0:13:20 > 0:13:23# It's really up to you. Yoo-hoo.
0:13:23 > 0:13:27# If you're wondering how a swimmer Swims or a bike can go so fast
0:13:27 > 0:13:32# Give it a bash and make it last It's time to go get sporty
0:13:34 > 0:13:38# Get sporty Doob-e-doob-e-doob-doob-doob-e-do-do
0:13:38 > 0:13:42# Get sporty Doob-e-doob-e-doob-doob-doob-e-do-do
0:13:42 > 0:13:46# Get sporty Doob-e-doob-e-doob-doob-doob-e-do-do
0:13:46 > 0:13:50# Get sporty Doob-e-doob-e-doob-doob-doob-e-do. #
0:13:50 > 0:13:53And remember, whether it's inside, outside,
0:13:53 > 0:13:57on a bike or in a pool, we can all try something new and get sporty.
0:13:57 > 0:13:59See you again soon. Bye!
0:13:59 > 0:14:02ALL: Bye!
0:14:02 > 0:14:04Get sporty!