Hello, my name is Mrs. Mehrin and I'm so excited to be learning all about how sounds are made with you.

We are going to do brilliantly.

Welcome to today's lesson from the unit Introduction to Sound.

Your lesson outcome today is: I can identify that sounds are made when something vibrates.

Now, I know that learning can sometimes be a little bit challenging, but that's okay, because that means that we're going to do lots of new learning together and we are going to have a fantastic time doing it.

Let's begin.

Here are your keywords for today.

Now, you don't need to write these down because I am going to be referring to them throughout today's video.

However, if you do find that it helps you to write them down, that's absolutely fine and you can do that now.

Fantastic, well done.

And here are the definitions for those keywords.

Again, I am going to be referring to these throughout today's lesson, so please don't worry about writing them down.

But again, if it does help you, you can jot them down now.

Off you go.

Fantastic, well done.

So today's lesson is split into two sections.

Let's begin with the first one, sounds and vibrations.

So there are sounds all around us.

I want you to have a little think, what sounds can you hear right now? You can pause the video here if you'd like and just listen.

I'd like you to pause the video here.

Off you go.

Fantastic.

So you may have heard a clock ticking.

You may have heard a car engine and you may have heard people talking.

Now, do you know how sounds are made? Again, I'll give you some time to think about this answer.

I'll give you five seconds, but if you need longer, you can pause the video here and you can come back once you are ready.

Off you go.

Fantastic.

So sounds are made when an object vibrates.

Now, a vibration is a repeating forwards and backwards movement when something shakes or it wiggles.

Now, when we speak, air moves past flaps of skin at the back of our throat.

These are called vocal chords.

And this causes them to vibrate and make a sound.

Now I'd like you to watch this video of what happens when music is played through a speaker.

What do you observe is happening to the speaker? So we can see that the speaker is moving backwards and forwards and this is the speaker which is vibrating.

Now, an object has to vibrate for a sound to be made.

I want you to think really carefully here.

What do you think is vibrating when you hear these sounds? So what do you think is vibrating when a guitar is being played or a horse is galloping? I want you to have a go at that question.

I'll give you five seconds to think about your answer, but if you need longer, that's absolutely fine.

You can just pause the video here.

Off you go.

Fantastic, well done.

So when the guitar is being played, it'll be the strings on the guitar when they're being plucked that will be vibrating to create that sound.

And when a horse is galloping, it's its hooves on the ground as it gallops, and that's what's creating that sound.

Now, what other objects do you think vibrate to make a sound? I'll give you five seconds to think about your answer, but if you need longer, that's absolutely fine.

You can pause the video here and just come back when you are ready.

Off you go.

Fantastic, well done.

So let's do a quick check-in of your learning so far.

True or false? Sounds are made when an object vibrates.

Is that true or is that false? I'll give you five seconds to think about your answer.

If you need longer, you can pause the video here.

Off you go.

Fantastic, well done.

The answer is true.

Let's see if you can justify your answer.

Is it because A, a vibrating object makes repeated backwards and forwards movements, or B, a vibrating object stays very still and does not move at all? Again, I'll give you five seconds to think about your answer.

If you need longer, pause the video here and come back once you are ready.

Off you go.

The correct answer is A, a vibrating object makes repeated backwards and forwards movements.

And this vibration is what causes sounds to be made.

Now Jun is thinking about how sounds are made.

Jun says, "A book on the bookshelf does not make a sound.

But why do I hear a sound when I flick through the pages?" Can you explain why? Is it because A, the shelf is vibrating; B, the pages are vibrating; or C, your fingers are vibrating? Again, I'll give you five seconds to think about your answer, but if you need longer, you can pause the video here.

Off you go.

Fantastic, well done.

The answer is B, it's because the pages are vibrating.

Now, if an object is not vibrating, then it does not make a sound.

It needs vibrations in order to make a sound.

So if it's not vibrating, it won't make a sound.

Now, a drum does not make a sound when it is not being hit by a drumstick.

We hear the sound of the drum when it's hit and the drum skin is vibrating.

So here in this picture you can see some people playing drums. So every time that drumstick hits the drum skin, the drum skin vibrates and it causes a sound to be made.

When an object is still, it A, does not vibrate; B, vibrates; C, does not make a sound; or D, makes a sound.

I'll give you five seconds to think about your answer, but if you need longer, you can pause the video here.

Off you go.

Fantastic, well done.

The answer is A, does not vibrate and therefore C, does not make a sound.

So here is your first task.

I want you to play some music through a speaker and I want you to put your hands on the speaker.

Can you feel the speaker vibrating? Then I want you to stop playing the music, want you to put your hands on the speaker again and think about what it feels like now.

So I'd like you to pause the video here so that you can have a go at that activity.

Off you go.

Fantastic, well done.

Now I want you to try playing the music louder and then quieter.

And what do the vibrations feel like this time and why? So again, just pause the video here and have a go at that second part.

Off you go.

Fantastic, well done.

Now here is the second part of your task.

It says, gently strike a tuning fork.

Can you feel the metal vibrating? I want you to strike the tuning fork again and hold it so the ends are just touching the surface of water in a small dish.

What do you observe and why do you think this is happening? So I'd like you to pause the video here and have a go at that.

Off you go.

Fantastic, well done.

So for the first task, when I put my hand on the speaker, I can feel the vibrations on my hand.

If I play the music louder, the vibrations feel stronger.

If I stop the music, the vibrations stop.

Number two, what happens when the vibrating tuning fork touches the surface of the water? When I held the vibrating tuning fork over water, I could see the water vibrating in the form of ripples and some of the water made a splash.

I think the tuning fork was wobbling and this wobbled the air around it and the surface of the water.

Well done.

You are doing so well.

Let's move on to the second part of our lesson today, which is making different sounds.

Different objects make different sounds.

What type of sounds do these objects make? I'll give you five seconds to think about your answer, but if you need longer, you can pause the video here and come back once you are ready.

Off you go.

Fantastic, well done.

So the first one would make a deep thud.

The second one, a sharp ring.

And the last one, a quiet click.

I want you to now pause the video and I want you to think about which objects around you make different sounds and what kind of sounds do they make.

Off you go.

Fantastic, well done.

Now, vibrations and sounds can be made in different ways.

Tapping a balloon makes the balloon skin vibrate, resulting in a drum-like sound.

And running a wet finger along the rim of a glass causes the glass to vibrate and produce musical tones.

Jun makes a list of all the different ways he can make an object vibrate to make a sound.

So he's got tapping, blowing, banging, shaking, rubbing.

And Jun says, "Can you think of any more?" Again, I'll give you five seconds to think about your answer, but if you need longer, that's absolutely fine.

You can pause the video here and come back once you are ready.

Off you go.

Fantastic, well done.

So let's do a check-in of your learning so far.

Which statements below are true? A, you can make sounds by hitting an object.

B, you can make sounds by plucking an object.

C, you can make sounds by blowing an object.

And D, you can make sounds by scratching an object.

I'll give you five seconds to think about your answer, but if you need longer, you can pause the video here and come back once you are ready.

Off you go.

Fantastic, well done.

The answer is all of them.

All of these are ways that you can make sounds.

Now, objects made from different materials produce different sounds.

Andeep says, "Different materials vibrate in different ways.

This changes the sound they make." And Izzy says, "When tapped on a table, a wooden spoon makes a different sound to a metal spoon because they are made from different materials." Now, Andeep and Izzy continue thinking about how vibrations and sounds can be made in different ways.

Andeep says, "How hard you hit an object also has an effect on the sound it makes." And Izzy says, "If you hit an object hard, it will vibrate more and this will make a louder sound." Let's do a quick check-in of your learning so far.

True or false? Different objects produce different sounds.

Is that true or is that false? I'll give you five seconds to think about your answer, but if you need longer, you can pause the video here.

Off you go.

Fantastic, well done.

The answer is true.

Different objects do produce different sounds.

Now let's see if you can justify your answer.

So is it A, the material an object is made from affects how it vibrates, or B, all materials vibrate in the same way? So again, I'll give you five seconds to think about your answer, but if you need longer, you can pause the video here.

Off you go.

Fantastic, well done.

The answer is A, the material an object is made from affects how it vibrates.

So here is your second task.

It says, complete the table and add some of your own ideas to the list.

So think about the actions on the side.

So here we have a whisper and the sound it creates is a whisper.

Now I want you to think really carefully what is vibrating in order to create that sound.

Now for the second one, we have glass breaking.

So think about what kind of sound that would produce.

And then we can see that it's the glass which is vibrating in order to create the sound of the glass breaking.

Then you have knock on a door.

So think about what kind of sound a knock on a door would make and what is vibrating in order to create that sound.

Then I want you to have a go at adding some of your own ideas to the list.

Think about the sound that it creates and what is vibrating in order to create that sound.

So I'd like you to pause the video here and have a go at that activity.

Off you go.

Fantastic, well done.

So here are some of the examples that you may have come up with.

So the glass breaking, it would be a smash, and it's the glass that's creating that sound that's vibrating in order to create it.

A knock on a door is a thud and it's the material of the door.

So now this could be different based on the material of the door that you have tested.

So if it's a wooden door, it would make a thud.

However, if it's a metal door, that sound may be different.

Now this person here has chosen thunder and they've said that the sound is like a rumble and it's actually the air that is vibrating to create that sound.

They've also chosen to do clapping your hands, so it makes a clapping sound, and it's your hands that are vibrating in order to create that.

And they've also chosen jumping in water, which is a splashing sound, and it's the water there that's vibrating in order to create that splashing sound.

Now we are on to the summary of your learning today.

So sounds are made when an object vibrates.

If an object is not vibrating, it will not make a sound.

Vibrations and sounds can be made in different ways.

Well done for today.

You have worked really hard on our new unit and you have used your critical thinking and you have worked wonderfully.

Fantastic job.

Well done.