Lesson video

Hi everyone! I'm Miss Harris and welcome to today's science lesson.

How are you doing today? Good, I'm glad to hear it.

Now we're going to be answering this question today.

How do we hear? Hmm.

I'm not sure.

Do you think you can join me in this journey today to find out how we hear? Good.

Okay, so this is what we're going to be doing today.

We are going to be recapping what sound is.

We're going to be identifying sounds.

We're going to be looking at can everyone hear? Then we're going to be looking at what we can do to support people who are deaf, so people that cannot hear.

And lastly, we're going to be looking at how some sounds can keep us safe.

You will need an exercise book or a piece of paper, a pencil to do some writing.

You will need a coloured pencil or pen so that you can mark your work.

And lastly, you're going to need your brain.

Have you got your brain? Can you just check it, check to make sure it's in your head, hasn't fallen out of your eyes.

Good.

So, in this unit, we are going to be scientists.

We need to recap what a scientist is.

Can you remember? So I a scientist is a person who studies the world around us, including the living and non-living things.

Should we do that one more time? Can you say it with me? A person who studies the world around us, including the living and non-living things.

Good.

Now, our star words are the important words that we are going to be using a lot this lesson.

So it's important that we practise them.

Are you ready? So it's going to be my turn, then your turn.

Sound.

Did you say it to your screen? You can talk to your screen.

Sound.

Vibrations.

Messages.

Aid.

Deaf.

Volume.

Communication.

Well done.

Now take a look at this question.

What is sound? Can you remember what sound is? So we're going to have a look.

Sound is a mm of vibrations that mm through the mm.

In your books, I would like you to write down this sentence.

What is sound? There are some gaps.

So take a look at the pictures above the gap so that you can think about what that word is going to be.

So pause the video and have a go at answering this question now.

Great job.

Now pick up your coloured pen or pencil.

We are going to mark our work.

So we're going to see whether we got the correct answers.

If we didn't get the right answer, that's okay.

That's what the coloured pencil is for so that we can fix it.

So sound is a wave of vibrations that travel through the air.

So if you wrote wave, give yourself a tick.

If you wrote travel, give yourself a tick.

If you wrote air, give yourself a tick.

And if you made sure that you put a full stop at the end as well.

If you didn't get those right, you can pause the video now and you can check your answer.

Now, we are going to do a bit of a brain warm up now.

Because sound is a wave of vibrations that travel through the air.

And those sounds, those waves, the invisible waves go into our ears and help our brain remember what the sound is.

It sends little messages to our brain.

Now, some sound that you may have heard before, like this sound, a clap, if you didn't see Miss Harris clap, you might hear the sound clap because your brain knows that that is the sound of a clap.

So I'm going to show you now some pictures of some things that make sounds, and I want you to decide which one is louder or quieter.

So let's have a look.

Which sound is louder? You're going to use your finger to point.

Is it the doorbell or a firework? So these are sounds that you have probably heard before.

So remember that the volume is the loudness of a sound.

So which one is louder? The firework.

Fireworks are really loud.

You cab hear them from a long way away, can't you? Okay, the next one.

Which sound is quieter? Which sound's quieter? Leaves rustling or a car engine, vroom vroom vroom.

Which one? Leaves rustling.

I think so too.

Now, which sound is quieter, a drum or a bird tweeting? Which one do you think is louder? Sorry, which one do you think is quieter? Quiet.

Point to it.

So I think that the bird tweeting is quieter than the drum.

Well done.

Now waves are made when an object vibrates.

So it vibrates to make a sound.

Every time an object vibrates, it sends little waves through the air.

Remember cause it makes the air vibrate around.

And they send them go into our ears and send invisible messages to our brain, which our brain understands as sound.

The guitar makes a sound.

It sends invisible waves through the air into our ears.

These invisible waves send messages to our brain so that we can hear the sound.

So let's have a look at what happens when I move a guitar string.

You are going to be able to see it in slow motion.

You're going to be able to see the guitar string vibrating on the guitar.

Let's take a look.

Wow.

Did you see the guitar string vibrating? You did, good.

So that vibration caused the air around it to vibrate so that our ears could hear the sound.

Goodness.

Sends invisible message to our brains.

So let's get our brain thinking about sounds.

I'm going to play you some sounds now.

And I want you to tell me what sound you can hear.

Are you ready? So the first one.

What sound is this? It is someone coughing.

Did you get that right? Good.

Now remember that our brain remembers sound, which help us know the sound even if we can't see it.

So let's try another one.

So tell your screen what sound is this.

Did you hear that? It was the sound of rain.

Did you get that right? Good, well done.

So you've heard rain before and your brain remembers that that's the sound of rain.

Okay, let's try another one.

What sound is this? Did you hear it? It was the sound of someone eating an apple.

That was a bit of a tricky one, wasn't it? Okay.

The last one.

What sound is this? It was the sound of a whistle.

Did you get that right? Well done.

Okay.

Now, I want you to think about this question.

Oh, sorry.

Can everyone hear? Have a think.

Does everyone have the ability to hear? So the answer is no, not everyone can hear.

Hearing is one of our five senses.

We hear with our ears, good! And some people are not able to hear.

People who are not able to hear are deaf.

So if someone says to you, "I'm deaf," that means that they cannot hear with their ears.

And we're going to look at some reasons why some people might be deaf and we're also going to look at things that help people who are deaf communicate with other people.

Okay? So here are some examples of why some people might be deaf.

So the first one is that some babies are born deaf.

So when you're born, sometimes you are just born deaf.

You might be born without the ability to hear.

And that's okay.

When you grow older, sometimes you lose your hearing and you find it harder to hear.

So my nan, when I ask my nan a question, she always has to ask me to say it again because she can't hear very well.

And that's okay.

That just means I need to speak a bit louder and clearly.

Now you could also lose your sense of hearing if you injure your ear.

So if you really hurt your ear.

Like putting something in your ear could really damage your ear.

So we have to look after them.

Ooh, a really loud noise could sometimes hut your ear and damage it 'cause they are really, really sensitive to sounds.

So we have to make sure that if we've got things like headphones on, we have to make sure it's turned all the way down.

The volume isn't really loud when we first put in our headphones, and that we're not listening to things that are really loud.

So we don't damage our ears.

So in your books, I would like you to write down two reasons why someone might be deaf, two causes.

You can start your sentence with this.

A cause of deafness is mm and mm.

Pause the video, have a go at that now.

Okay, so remember you could have said some babies are born deaf.

When you grow older, you lose your hearing.

You might seriously hurt your ears.

Or maybe very loud noises have caused your ears to become damaged, your hearing.

So, some people who are deaf or somebody who cannot hear very well, because sometimes you can hear a small amount of sounds, but you are partially deaf.

So you're a little bit deaf, but not fully deaf.

So some people can hear some sounds, whereas you might be able to hear all sounds, or you might be able to hear no sounds.

So some people are in the middle.

So if you are deaf or you have trouble hearing, you can use lots of different things to help you.

We're going to look at those things.

The first thing that people might use is something called sign language.

Have you heard of that before? You have! So sign language is when people use their hands, their lips, and their facial expressions to speak to each other.

It's like a language, like English, but people use their hands to communicate.

Lots of people who are deaf also use sign language so that they can speak to other people who are deaf.

So for example, Miss Harris.

I'm not deaf, but I might use sign language to speak to someone who is deaf because that's a way that they can communicate.

So this picture here is specifically for people who are left-handed, so write with their left hand.

So you can see lots of letters here to make words.

So this is the letter B.

So people might use that to spell out a word that's got a B in it.

Now, we're going to practise saying hello and asking how someone is using sign language.

So the first one, which I'm sure you know already, to wave your hand like this, you can say hello.

Can you say hello? Great job.

Now, to ask how someone is, we're going to practise saying "How are you?" in sign language.

To say "How are you?" you go like this.

You bring your hands like this and you move them up, and then you bring them forward in like a thumbs up.

Ready? Let's do it again.

So follow me.

Go up, thumbs up.

Good, should we try it one more time? So hands going up, thumbs up.

And you can say "How are you?" Ready? How are you? Well done.

Let's do it all together.

Hello, how are you? Ready? Join in with me.

Hello! How are you? Great job.

Now someone might ask, how are you? Let's practise saying "Good, thank you." So a response.

So if someone says, "Hello, how are you?" you can say, "Good.

"Thank you." Can you do that with me? So I'm going to say, "Hello, how are you?" I would like you to say, "Good.

"Thank you." So move your thumb across.

Good.

Thank you.

Ready? Hello.

How are you? Your turn.

Good.

Thank you.

Well done.

Great job! So now, if you meet someone who is deaf or struggles with their hearing, they might know sign language so you could practise saying "Hello, how are you?" And ask them how they are.

And they might say, "Good, thank you." Well done.

So let's move on.

Another way that people can communicate if they are deaf or they struggle with their hearing is they might have something in their ear that looks like this.

Do you know what this is called? It's called a hearing aid.

What's it called? Good, a hearing aid.

It fits just inside the ear.

Sometimes it wraps round the back of the ear, and it's a special little device that helps people who are deaf to hear sounds.

Really clever, isn't it? Good.

Now, the last reason, the last thing that people might use if they're deaf, they might do something called lip reading.

So, do you remember earlier I mentioned that my nan struggles to hear.

So sometimes I have to speak louder so she can hear me, but also more clearly because she's doing something called lip reading.

So she's looking at my lips to look at the movement that they are making so that she can hear the sounds, so she can see the sounds instead of hearing them.

So she might see me saying hello, but she might not be able to hear me.

So instead it looks like this.

And she knows that I said hello, because she recognises the movement that my lips are making with the word hello.

How clever is that! Goodness me.

So that's another reason that people, another thing that people use if they are deaf.

So we've got sign language, we've got hearing aids, and we've got lip reading.

Now I would like you to fill in the gaps to the sentences.

You can choose whether you want to write them down or you can fill in the gaps.

So let's read them together.

Number one says, some people who are deaf use British mm language to communicate, to speak.

What word do you think goes in that gap? Now you can choose to write it down or you can tell your screen.

So if you're going to write it down, pause it now and fill in the gap.

So let's have a look at the answer.

Some people who are deaf use British sign language to communicate.

Did you get that right? Good.

Number two.

If you are deaf, sometimes you can use a mm aid to hear.

What is that word that goes there? If you are going to write it down, you can pause the video now and fill in the gaps.

So if you are deaf, sometimes you can use a hearing aid.

Did you get that one right? Well done! And the last one.

Hearing is one of our mm senses.

If you're going to write it down, pause the video and fill in the gap now.

So let's see the answer.

Hearing is one of our five senses.

Great job! So how can sounds keep us safe? There're lots of sounds around us that our brain remembers.

An example of this can be crossing the road.

When you cross the road at a traffic light, it goes beep beep beep beep beep beep beep.

If you are blind and can't see, so that means if you are blind and you don't have the sense of sight, but your hearing is really good, that sound tells you that it's safe to cross the road.

Another sound that keeps us safe is an ambulance siren or a fire engine.

That sound that they make tells us that the vehicle, the car is coming really fast along the road.

So we can look out for it and move out of the way so we can get past.

That keeps us safe because we can hear it when it's coming.

Look at these two pictures.

How can the sound of a fire alarm and a police siren keep us safe? Pause the video and have a think about how a fire alarm and a police siren keeps us safe.

So a fire alarm tells us that somewhere there is a fire.

So we have to escape the building or the place that we are in and find somewhere safe because it tells us there's a fire.

And a police siren, similar to a fire engine or an ambulance, it tells us that a police car is coming along the road really fast so we need to move out of the way or stay on the path.

Now for this week's experiment, you are going to need an exercise book or a piece of paper, a pencil, and your ears.

We are going to be answering this question.

What other sounds can keep us safe? If you've got your exercise book, I'd like you to write down that sentence.

What other sounds can keep us safe? That's what we're going to focus on this week.

So you are going to need to gather your materials, like your pencil and your paper.

You are going to listen to sounds around you.

You are going to write down what you can hear.

And you're going to think about how can that sound keep us safe.

And lastly, I want you to think, can we hear the sound somewhere else? So at school, we have a fire alarm.

And at your school, you might go outside to your playground or maybe your field, if there is a fire.

But that fire alarm, you might have a sound that's similar in your house.

Maybe you've got a fire alarm on your ceiling to tell you if there's a fire in your house.

So you could hear a fire alarm at school and at home.

So that's something you might write down.

Think carefully.

Does the sound keep you safe? So I've got a picture of a door on here because when I lock my door before I go to bed, my front door, hearing the sound of it, click, tells me that it's locked.

So I know, when I go to bed, that if I hear that sound, I know I've locked my door correctly and I can check it by pulling the handle down.

But that means it's locked and I'm safe and sound.

But if I didn't hear that sound, that click, when I locked it, there might be something wrong with my door.

So that would tell me that it's not locked properly.

You've worked so hard today.

Give yourself a pat on the back.

Should we do a rainbow cheer? Yeah, so hold your hands out like this.

We are going to do a rainbow cheer because we've worked really hard today.

So you guys go like this.

Make a rainbow with your hands.

You ready? Three, two, one.

Great job.

Now, if you would like to send us your work, you can ask your parent or carer to share a picture on Twitter using the tag OakNational and the hashtag LearnWithOak, and we will be able to see it there.

Have a lovely rest of your day.

And I will see you next time.

Bye!.