Sink Or Float | Water Science Experiment for Kids | Surf's Up | Circle Time with Khan Academy Kids

(gently chiming bells)

- Hello friends,

welcome to Circle Time.

I am Caroline, from the
Khan Academy Kids team,

and I'm here today with my friend Sophie.

Hi Sophie.

- Hi Caroline.

Hi friends.

I am so excited to be

with you today for circle
time with Khan Academy Kids.

- How are you all feeling today?

- Good question, Caroline.

It's nice to ask our friends,

how they're feeling today.

And I'm looking around
the circle at our friends,

and some of our friends
are feeling excited,

and some of our friends,

our friends are feeling, happy

and one of our friends

is feeling a little bit frustrated,

because they would really
like to go outside.

And another one of our friends
is feeling very active,

like they have a lot of energy.

- Well, I am so excited to see all of you.

Thank you for joining us.

We have a lot of splashy water fun today.

We have a story about some water

and it's called "That Won't
Float!" by Cynthia Platt.

One rainy day,

Kodi went to visit Sandy.

"We can't play outside,"

Sandy told Kodi.

"what should we do?"

"Let's play Sink or Float!" Kodi said.

Friends, have any of you
ever played Sink or Float?

- Some of our friends
are nodding Caroline.

- Well, let's find out
what the game is about.

They found a large container
and filled it with water.

"We need to be careful!"Sandy exclaimed.

"We don't want to spill any."

"We're always careful." Kodi replied.

"I'll try this ball first," said Kodi.

"it's light,

"so I bet it'll float."

"I have chosen this rock." Sandy replied.

"It's heavy,

"so it will probably sink."

The ball babbed to the top,
and the rock sank down.

"Our predictions were right!" Kodi said.

"I guess this wooden block
will sink too," Sandy said,

"it feels heavy."

When she put the block in though,

It didn't sink.

Instead, it bobbed on the surface,

like the ball did.

"My prediction wasn't right that time."

she told Kodi.

Friends, do you know what a prediction is?

- Is it when you have an idea
how something might turn out,

a guess, about what might
happen is a prediction.

- So I think in this case,

Sandy was predicting that
the block would sink.

"My turn, I'll try this
dinosaur." Kodi said.

"That won't float, Sandy replied.

"it's too big."

"It won't float." Kodi agreed.

"because it's going to...

"Cannanball." Kodi exclaimed.

Water splashed everywhere.

Kodi and Sandy were as
wet as the dinosaur!

"Oh my," Sandy said, "Why'd you do that?"

"Because it's fun to
get wet."Kodi replied.

"You're right." Sandy agreed.

"Look, the sun has come out.

"How do you feel about going for a swim?"

"Let's do it." Kodi said.

It turned out. They both
liked the cannanball, too.

What a fun splashy story,

It was actually a splashing story.

(laughing)

So friends,

should we try to play Sink
or Float on Circle Time?

- Yeah, let's see,

if we can predict

what might sink,

and what might float.

- Sounds good.

Hold on for one second,

I have to go get my bowl of water.

- Oh, okay.

- All right friends. Are you ready?

Let's try, a rock.

You see this rock? It's pretty.

Mm-hmm.

It's pretty, heavy and dense.

What do you think will happen?

- Oh, I just asked some of our friends,

and one of our friends says
they have seen a rock sink,

into some water before.
So, I think it might sink.

- Okay. Let's try it.

Whoa.

(chuckles)

It sank to the bottom.

Can you see it's all the
way... It's underneath.

- Oh yeah. It went down,

below the surface of the water,

and sank to the bottom
of the bowl, friends.

Because it's quite heavy.

- That's right.

And what about this boat?

Actually a paper boat.

We made it out of paper.

What do you think? It's a boat,

So there's maybe one clue.

- Well, one of our friends is saying

that boats usually float.

So if it's a good boat, it should Float.

- Okay. Should we try it?

- Mm-hmm
- Mm-hmm

- Oh, Cool.

- That is cool.

And just for fun, I brought a straw.

I don't know what will happen,

if I blow some air at the
boat, should we try it?

- Mm- hmm. Oh wow.

- It's kind of like wind.

- That's cool.

- Yeah. So why do you
think, some things sink

and some things float?

- Whoa, I don't know Caroline.

Can you help us out, please?

- So I think things are made
out of tiny, tiny molecules.

So you can't see them
unless you use a microscope,

That's kinda like this.

So everything that we see, is made out

of a little tiny minute molecules.

So if the molecules
are very close together

and are very dense, like
in this rock, it will sink,

because it's denser than
the molecules in the water.

But a boat like this floats,

because the molecules are further apart.

And I also think in this
case, because it's spread out

over some surface area, that
helps it float on the surface.

Let's try a few more.Look at
this egg. It's not a real egg,

It's a little shaker egg.

- Maybe it will float.

- Let's try.

Ooh, it does float.

- Wow.

- And then, this other
egg, it's hollow inside.

So there's air inside.

- Oh, interesting. It floats right on top.

The other egg has some shakers in it,

so it's a little heavier.
So it sinks halfway down,

and just has a little bit peeking out.

And the egg that's full of
air, which is very light,

those molecules are extra spaced out,

it's just bobbing along right on top.

- Exactly, just like Sophie was saying,

that air is very light.

That molecules are spread apart

and this is a hollow egg,

so there's nothing inside
of it except for air.

So that's why it looks...

One more, I have this funny brush.

What do you think?

What's the prediction on this one?

- I need to ask our friends.

Well, one of our friends predicts,

that this brush will sink to the bottom.

That it's too heavy to float.

- Let's try it.

- Oh wow. Well, it's
good that we had a guess,

and that we had a go

and it seems like
actually, the brush floats!

- It does.

That was the last one.

But I have a very interesting one.

What do you think will
happen with bubbles?

Should we try the bubbles?

If I blow bubbles

and they land on the water,
what do you think will happen?

- Well, it's full of air,

so they should float on top of
the water, but I don't know.

- Can't even get it onto
the water. Let's try again.

- A few little bubbles
are floating on the water.

- There. We got a big one.

- A big one, it looks like a dome.

- Yes, that one has lots of air in it.

That's floating on the water.

Thank you friends for
playing Sink or Float.

Just like Kodi and Sandy.

Should we do some Show and Tell now?

- Ooh. Yeah. I would love
to do some Show and Tell.

And if our friends... while
you're doing this Show and Tell,

if our friends, ever want to
see any of our other books,

and see what else Kodi and

Sandy and their friends are getting up to,

they can probably download
our app, Khan Academy Kids.

- That's right. We have
lots of books in the app.

All right. Let's do some Show and Tell.

All right.

Ari sent us a drawing
of all those bath toys.

I think those-- what do you think friends,

will those sink or float?

- Mm- hmm,

I think they might float.

- I think so too.

One looks like a submarine,

and one looks like a dinosaur.

- Yeah. They're very cool
Dinosaur with pink and orange

- And a nice smile.

- Thank you Ari.

- And Veda sent me their
drawing of a Dino and Submarine.

- Wow. I think there's a
theme here, isn't there?

That's two dinosaurs we've seen,

and two submarines. Thank you, Veda.

- Thank you.

And now we have Quillin, who's going

to show us how to surf in the ocean.

He has practiced a lot,

and his surfboard floats,
on the top of the ocean.

Hello Quillin.

Hi Quillin.

Hi, I'm Quillin. I'm going
to teach you how to surf.

First, you paddle out,

and then when you see
waves you start paddling,

then stand up,

and then you can try a few tricks,

but if you're a beginner and
you have never surfed before,

then it's probably best for you

to catch water instead of waves.

- (woman)Okay. Are you
ready to go surf? Let's go!

(bright upbeat music)

(waves)

(soft music)

(soft music)

(ocean sounds)

(cheering)

(soft music)

(ocean sounds)

- Thank you Quillin for
showing us how to surf.

That was a special video
that you shared with us.

And now to wrap it up,

we have one more,

Semi is going,

to show us how to carefully wash,

our hands, which is very important.

Thanks so much for sending us this video.

- (girl)This is the way we wash our hands.

So, what do you do first?

- You put on some soap then wash in water.

Then do like this, some a little

to get the soap out of there.
Because there might be some...

- (girl) Now you have to rub
the back with some more soap.

You need to rub the back of
your hand with more soap.

(soft music)

(running water)

- ♪ wash your hand, wash your hand ♪

- (girl) can you you
show them the butterfly?

And now, cut the dog.

(soft music)

- (girl) and now you
need a towel to dry it.

- I usually dry like this
because I can't reach up there.

- (girl) say bye to everybody.

- Bye guys... watch more...

- Remember to wash your hands.

- Always.

- Thank you Semi for showing
us how to wash our hands.

- Wow. That was such a cool end.

We had floating and sinking,

we had lots of Show and Tell stories,

We saw Quill and surfing,
and then we were reminded,

how important it is to wash
our hands with soap and water.

What a great water kind of day--

- It was.

(laughing)

Thank you all for joining us.

And we will see you all next time.

Goodbye for now, from Caroline

Sophie and the Khan
Academy Kids team.Bye bye.

- Bye friends.