Lesson video

Hi everyone.

I'm Ms. Harris and welcome to today's science lesson.

How are you doing today? Great.

Should we start today's lesson off with a virtual high five? Ready? High five the screen, but careful you don't break it.

Ready? 3, 2, 1, go! Good job.

Now today we are going to be doing our experiment using the walls that we made in our last lesson.

Now don't worry if you didn't join in last lesson because you can watch me do today's experiment and join in by writing a table of results.

Very exciting.

So we are going to start by doing our star words.

We're then going to recap what height and length mean.

We're going to look at the properties of a wall, what makes a really good wall.

We're going to look at the groups of materials that we used for our experiment.

And then finally, we're going to do our experiment.

For today's lesson, you will need an exercise book or a piece of paper, a pencil, a coloured pen or pencil, and your brain.

If you need to go and get any of these things, you can go and get them now.

Great.

Now, if you would like to take part in the experiment today, because you made some mini walls, last lesson, you will need to find these objects.

So you will need some space so that you can do your experiment.

Somewhere where it can get wet.

You will need a jug of water.

You will need a colander, or you could use a plastic bottle and poke holes in the bottom.

And you will need your wall creations that you made.

Now, if you need to go and get any of these things prepared, you can pause the video and go and get them now.

Well done.

Let's do our star words.

Conduct.

Conduct.

That means to start.

So we're going to conduct an experiment, to start an experiment.

Weak.

Strong.

Structure.

Water.

Method.

The method is our instructions.

Great.

So, it changes.

Now! Good.

We are going to be testing out whether our walls that we made last lesson are strong enough to withstand lots of rain.

Now, as I said, don't worry if you don't have the materials, because I'm going to show you and you're going to fill out a table later on.

So you're going to be joining in too.

Let's recap what height and length mean.

As we need to know with our wall.

Whether our wall is going to be tall, or whether it is going to be long.

So is this picture height or length? So looking at the purple line, is it showing height or length? It's showing height because remember, height is how tall something is.

Is this one showing height or length? It's showing length.

Length is how long something is.

Now looking at the pictures again, which one shows length? Pause the video and answer it now.

Okay.

Let's check.

So that one.

Where the tick is is showing length.

Height is how tall something is.

Length is how long something is.

Great job.

Now let's take a look at the properties of a wall because walls are part of structures, part of buildings.

And they help protect us from everything outside and they help keep us safe on the inside.

So here is a brick wall.

Thinking about a wall.

It is used to build houses and buildings and bricks are very strong.

They're really strong material.

I would like you to think about which words in my word bank on the other side, do not describe a wall.

So that's another thing.

We've got weak.

So something that breaks easily.

Strong.

Wobbly, something that moves.

Sturdy means that it's safe so it's really sturdy.

Soft.

Hard.

Absorbent.

So remember, absorbent means it soaks up lots of liquid.

Waterproof, that keeps the rain out.

Okay, I am going to read them one more time.

Weak.

Strong.

Wobbly.

Sturdy.

Soft.

Hard.

Absorbent.

Waterproof.

Which words do not describe a wall? I want you to pause the video and I want you to point to the words which do not describe a wall.

Great.

So let's check.

So all of these words are the words which I wouldn't use to describe a wall.

Because if a wall was really weak, it would fall down and break easily.

If it was wobbly, that wouldn't be very good, would it? Because we'd always be worried if it was going to fall down.

If it was soft, again, it might not survive and it might fall down.

And absorbent.

Again, if it was soaking up the liquid from outside, eventually the material would collapse and it would break.

Because it wouldn't be strong enough to hold the wall up and hold everything above it.

So it wouldn't be able to keep the roof on the top either.

But we've got words like strong, sturdy, so it stays standing, hard and waterproof, so it keeps the water out.

Because we don't want to walk through our classroom that's going to absorb the water and make us wet, do we? So now, in your books, I would like you to write down the properties of a wall.

So I've hidden the words that you can see here.

So I'd like you to write down four words, four properties, to describe a wall.

Pause the video and do that now.

Well done.

So we've got strong, sturdy, hard and waterproof.

Are they the ones that you wrote down? Great, give them a tick with your coloured pen if you got those right.

Now it's time to move on to our experiment.

So let's recap what groups of materials we used.

So our walls are made from play dough, hay or straw.

I used straw for one of mine.

I didn't use hay.

Twigs or lolly sticks.

I used lolly sticks.

Sugar cubes.

And we used plastic bricks.

I used LEGO.

So I made a wall using all of these materials.

You might have made one wall because maybe you have some of these things here.

Or maybe you didn't make them because you're watching me and that's okay too.

Now, in your books, I would like you to draw this table.

It doesn't need to be a perfect table, but we're going to be using this to write down the results of our experiment today.

So if you need a grownup to help you draw this table, you can pause the video and you can do that now.

Or you can just draw the lines in your book like this and write the tables up.

Write the words on.

Great.

So hopefully you've got your table ready to record all of the results from today's experiment.

You're going to need it when you're watching me or when you're doing it.

So here is our method.

These are the instructions for our experiment.

So first, clear a space and move any valuable items because we're going to be pouring some water.

So we don't want anything around us that's going to get wet.

You will need to choose a wall which you have made.

So you're going to put your wall on a spot that you're going to pour water onto it.

You're going to pour a small amount of water on the top using the colander.

So I'm going to hold my colander and I'm going to pour the water into the colander to create some rain.

You're then going to observe any changes to the wall.

And lastly, you're going to think, is the material waterproof or is it absorbent? Because today we are testing whether our materials are waterproof or absorbent.

Because in the rain forest, it rains.

So we are creating our own rain to see whether the wall is strong enough to survive because it needs to be waterproof, doesn't it? But before we do any experiment, we need to have our scientist safety equipment ready.

So if you have got a white shirt or a white jacket, you can pause the video and go and get that now.

Because we need a lab coat or a white coat or a shirt to keep us safe and dry when we're doing the experiment.

Now even if you're not doing the experiment and you're watching me, I'd still like you to join in by getting a white shirt, if you've got one.

So pause the video, and go and get it now.

Great.

Now I need your help.

Do you think that you can help me put on my lab coat? Just like last time.

You can? Great.

Now to help me put on my lab coat, we're going to need to get the magic started by rubbing our hands together.

Are you ready? Rub them together.

Really fast.

Rub them up here.

Rub them down there.

Rub them to the side.

And the other side.

And in front.

Are you ready? So now we've got the magic started.

We're going to clap, clap, tap, tap.

And then my lab coat will appear.

Are you ready? Clap, clap, tap, tap.

Oh! You are so magical.

How do you do it? How do you get my lab coat on like this? Every lesson.

You are incredible.

Now I've got my lab coat on, we're ready to start today's experiment.

So now you're going to begin your experiment if you have the materials.

So remember, you're going to put a tick or a cross on the table as to whether the material is waterproof or absorbent.

Once you've finished your experiment, you can press play and you can carry on watching me.

Okay, so if you're doing the experiment, pause the video now.

If not, carry on watching to watch me do it.

So I have got a jug of Squash so that we can see the liquid when we're making rain.

I've got my colander so that I can pour the liquid into the colander.

And then we can put all the liquid in and it will make rain out of the bottom.

Okay? So first I am going to have a go at the plastic, sorry, the play dough.

There's my wall.

And I'm going to pour some liquid over the top and we are going to watch whether the wall can withstand some rain.

Okay.

You ready? Are you watching carefully? Okay.

So now I've created some rain.

Has the play dough been affected by the liquid? It's a little bit slimy.

But the wall has stayed the same really, hasn't it? And the liquid has just poured off of the play dough.

So I would say that the play dough gets a thumbs up.

It has survived the rainfall.

Okay, so we are going to fill out our table now that we are about to begin our experiment.

So if you are doing this experiment at home and you have any of these already filled out, don't worry.

You can just keep watching.

These are the materials that I have got for my experiments.

I'm going to be using play dough.

I'm going to be using straw, not hay.

I'm going to be using lolly sticks.

I'm going to be using sugar cubes, and some plastic bricks.

So remember, I'm not using twigs here.

I'm using lolly sticks instead.

So we have just seen the play dough being rained upon when Ms. Harris created some rain.

Was the play dough waterproof or was it absorbent? Now, on your sheet, can you put a tick in the box whether it was waterproof or whether it was absorbent? So it was waterproof.

It was not absorbent.

Did you put that too? Well done.

Okay.

So let's create some rain on top of the straw material.

I'm going to pour some water on it and create some rain.

Okay.

So you can see that the straw has not absorbed any of the liquid.

You can see that the liquid has gone straight through all of the gaps within the straw.

If we were inside a house built of straw like this, then it might be quite wet.

We might get quite wet, wouldn't we? If we were inside a classroom built of straw.

So I think it is waterproof, but we might get a little bit wet.

So we need to make sure we build it a little bit better.

Now we're going to do the straw section.

So was it waterproof or was it absorbent? Now, remember, we want to know whether it's appropriate for our house that we're going to make.

So did the rain affect the straw? So, it was waterproof.

However, it wasn't absorbent.

So it was waterproof, but it wasn't absorbent.

But the straw had lots of gaps in it, didn't it? And it would have made us really wet inside.

So we need to make sure that if we were to build a wall using straw, we would need to pack all of the straw tightly together like this, instead of far apart, like that.

Now let's try the lolly sticks, the wooden lolly sticks.

Okay.

What has happened to the lolly sticks? I can see that the liquid has poured straight off of the wall.

You can see it's a little bit wet, isn't it? But I think that the lolly sticks have been quite strong in the rain.

You can see that they're a little bit wet, but they haven't fallen down and nothing has really happened to them, has it? Now, were the lolly sticks waterproof or absorbent? Can you complete your table by putting a tick or a cross? So the lolly sticks were waterproof.

They were not absorbent.

So they worked really well, didn't they? Now let's try the sugar cubes.

Okay.

Oh.

What is happening to the sugar cubes? Oh, oh, oh, It's going to fall.

It's going to fall down.

Oh, what can you see happening? It looks like the wall is melting.

What do you think is happening? Is the wall melting? No, the sugar is being dissolved into the liquid and you can see here very slowly, if I touch it.

Look, it's gone all crumbly.

Have the sugar cubes survived the rain? No.

Would we be nice and dry if we had a wall built by sugar cubes? No, we would not.

We would get really wet, wouldn't we? Now let's look at the sugar cubes.

Were the sugar cubes waterproof or absorbent? They were absorbent, you're right.

The water, the sugar cubes were absorbed within the water.

They almost disappeared, didn't they, by the end? And lastly, let's do the LEGO wall, the plastic wall.

Created some rain with the liquid.

Okay.

What has happened to the plastic bricks? Has anything happened? No.

So I can see here that the liquid has poured straight off of the bricks.

So that tells me that the bricks are, what? Are they waterproof or are they absorbent? You're right.

I think they are absorbent because look, the liquid has run straight off the wall.

Would you like to be in a classroom built by a plastic wall? Yeah, I think so.

I think it would protect us from the rain.

Now were the plastic bricks waterproof or absorbent? Which one do you think they were? Waterproof.

You're right.

They were not absorbent.

Great job.

Great.

So now we've done our experiment.

Let's conclude our results.

So let's look at the results.

So, which materials were waterproof? Have a look at your table or your sheet of paper.

Which materials were waterproof? I've got my table here.

Which ones were waterproof? Hm.

Which ones have got a tick in the column that says waterproof? I can see that the plastic bricks were waterproof.

Do you have another material that was waterproof on your table? Good.

Great.

Now, which material did we have which was not waterproof? So it was absorbent.

Which material was that? The sugar cubes.

You're right.

Do we want to build a wall out of sugar cubes in the rain forest if it's going to rain? No, we wouldn't because it would soak up all of, it would get soaked up within the liquid, wouldn't it? And then we would just have a big pile of sugary water instead of a lovely wall.

Well done.

You've worked really hard.

And now it's time to complete your end of lesson quiz, where you can show off everything that you've learned today.

Do you think you might be able to get them all right? I know that you can because you're a superstar.

Great! That is the end of our lesson.

I hope you've had a really good lesson learning about which materials are waterproof and which are absorbent.

Next lesson, we're going to continue our learning all about building a wall in the rain forest.

I hope you have a great rest of your day and I will see you next time.

Bye.