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Sounds Come from Things That Shake · vibration-makes-sound · 1-PS4-1

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Sounds Come from Things That Shake

with Lumi

Lumi the glowing firefly plucks a big rubber band stretched across a bright box, watching it shake fast and blur while sound zigzag waves float out all around.

Explain that sound is made when something shakes back and forth fast.
Identify the shaking part of a real object that is making sound.
Predict that when the shaking stops, the sound stops too.
Predict whether an object will make a sound based on whether it is shaking.

Key terms

vibration: a fast shaking back and forth, again and again
sound: what we hear when something vibrates
pluck: to pull and let go of a string so it shakes
vocal cords: the shaking parts in your throat that make your voice
amplify: to make a sound bigger or louder

Shaking Makes Sound

Every sound begins with something that shakes back and forth very fast. We call this fast shaking a vibration. When you pluck a rubber band you can see it blur because it is vibrating, and that vibration is what you hear as a buzz. Even your own voice comes from tiny parts in your throat that shake when you hum or talk.

No Shaking, No Sound

Because sound comes from shaking, a sound stops the moment the shaking stops. If you press your hand on a ringing bell or a tapped drum to hold it still, the sound goes quiet right away. Sound does not keep traveling on its own forever — it needs something to keep vibrating to keep the sound going.

Worked examples

You hold a ringing bell tightly so it cannot shake. What happens to the sound?

The bell makes sound because the metal is vibrating.
Holding it tightly stops the metal from shaking.
With no shaking left, there is nothing to make the sound.

Answer: The sound stops right away.

Hi friend, I am Lumi! Let me show you a secret about sound. Every sound starts with something that shakes. Shaking means moving back and forth, again and again, very fast. We call this fast shaking a vibration. Pluck a rubber band. See it blur? It is shaking fast. That is why you hear a buzz. Now gently touch your throat and hum. Feel that little tickle? Your throat is shaking! That shaking makes your voice. Strum a guitar string and it shakes. Tap a drum and the top shakes. Ring a bell and the metal shakes. Here is the best part. When the shaking stops, the sound stops too. Put your hand on a shaking drum to hold it still. The sound goes quiet right away! So remember: no shaking, no sound. If you ever feel stuck, just touch your humming throat and feel the shake. That is sound being born!

Activity

Look at each thing and predict: will it make a sound when it shakes?

Practice

Will a rock sitting still on the ground make a sound?

Touch your throat and hum to feel the shaking that makes sound.

Common mistakes to avoid

Sound keeps going on its own after it starts.Sound needs something to keep vibrating, so stopping the shaking stops the sound.
The big wooden guitar body makes the sound.The vibrating string starts the sound, and the body only makes it louder by amplifying it.

Check your understanding

What does something have to do to make a sound?

You hold a ringing bell tightly so it cannot shake. What happens to the sound?

Which part is making the sound when a guitar plays?

Recap

Every sound starts with a vibration, which means something shaking back and forth very fast. Plucked rubber bands, guitar strings, drums, bells, and even your throat all shake to make sound. When the shaking stops, the sound stops too.

Reflect

What shaking thing made a sound near you today?