(upbeat music) - Hi, everyone.

Today, I'm here with Zoe and we're going to talk all about sound and vibration.

You know, when something vibrates, that means it's moving back and forth really quickly.

Can you think of some things that vibrate, Zoe?

- My phone when somebody texts me.

- Oh, that's a great example.

So let's start with some tests, okay?

We're going to test out these objects over here.

We're going to make them vibrate and then we're going to share our observations.

All right, you ready, Zoe?

Why don't you pick up those drumsticks and I want you to make the surface of the drum vibrate and then tell me what you observe.

(drum thumping) - It makes sound.

- Excellent.

We made the drum vibrate, which made sound.

So let's try the same thing with the ukulele.

This time, we're going to make the strings vibrate.

(ukulele thrumming) What did you observe?

- It also makes sound.

- Excellent job, Zoe, you are such a great helper.

So we know that by making these objects vibrate, we create sound.

Now, we have another really cool experiment but this one is going to be a little bit messy.

So, Zoe, let's put on our goggles, so we can be safe.

And here's what we're going to do.

We have some liquid here that's made from corn starch and water.

And we're going to pour it into this plate on our speaker.

Now, Zoe, what do you predict is going to happen when we turn on the speaker?

- I think it's going to vibrate.

- Okay, well, let's go ahead and try.

Here's some for you.

Here's some for me and let's start pouring.

(speakers rumbling) Whoa.

Oh, my goodness.

Look at that.

Okay, now, Zoe, let's try turning up the volume.

(speakers rumbling) Wow.

(speakers rumbling) That is wild.

(speakers rumbling) Okay, let's turn it off now.

Zoe, what did you notice happen to our liquid when we turned on the speaker?

- It turned into like different patterns.

- Yeah, and then when we turned it up, it made even crazier patterns, right?

Yes.

Wow, thank you so much, Zoe, for helping me with that crazy experiment.

That was too much fun.

Thanks for learning with us.

And remember, never stop discovering.