Sound: Vibrations, Pitch and Volume (KS2)

SC14Sound

Vibrations you can hear.

Sound is made by vibrations that travel through a material to our ears.

Vibration → travel → ear.

🥁 vibrating object→〰️ travels through air→👂 ear

vibrations pass through a material (usually air) to the ear

Louder = bigger vibrations. Higher pitch = faster vibrations.

Learn the Ideas

1Sound starts with vibration.

Pluck a string, hit a drum, speak — something vibrates. Stop the vibration and the sound stops.

vibration = sound

2It travels through materials.

Vibrations pass through air (usually), and also water and solids. Sound CANNOT travel through empty space (a vacuum) — there’s nothing to vibrate.

needs a medium

3Volume and pitch.

Bigger vibrations = LOUDER. Faster vibrations = HIGHER pitch. A thin, tight, short string vibrates fast → high note.

loud vs high

💡 Key IdeaSound needs something to travel through — in the vacuum of space, no one can hear a sound, because there are no particles to carry the vibrations.

Worked Example

Why does a short guitar string make a higher note than a long one?

Short string

vibrates faster (more times per second)

→

Faster vibration

faster vibrations = higher pitch

→

✓ Result

a higher note (long string → slower → lower note)

Watch Out! Common Mistakes

‘Sound travels through space.’

It can’t! Space is a vacuum — no particles to vibrate. Sound needs a material (air, water, solid) to travel through.

Confusing loud and high.

Different things! LOUD is about the SIZE of the vibration (volume). HIGH is about the SPEED of the vibration (pitch). A quiet high whistle vs a loud low drum.

‘Sound travels fastest in air.’

Solids are faster! Sound travels faster through solids and water than through air, because the particles are closer together.

⬇ Cheat Sheet

SOUND

Sound is made by vibrations.
It travels through a material (air, water, solids) — not through a vacuum.
Bigger vibration = louder; faster vibration = higher pitch.
Sound travels faster in solids and water than in air.

Example: short string → faster vibration → higher note.

📖 Continue Your Journey

✓ SC1 Classifying Living Things ✓ SC2 Habitats and Adaptation ✓ SC3 Food Chains and Webs ✓ SC4 The Skeleton and Muscles ✓ SC5 Digestion and Teeth ✓ SC6 The Circulatory System ✓ SC7 Plants and Photosynthesis ✓ SC8 Life Cycles and Reproduction ✓ SC9 States of Matter and the Water Cycle ✓ SC10 Materials and Their Properties ✓ SC11 Reversible and Irreversible Changes ✓ SC12 Forces and Magnets ✓ SC13 Light and Shadows SC14 Sound SC15 Electricity and Circuits SC16 Earth and Space

→

Next Lesson: SC15 Electricity and CircuitsA complete loop for electricity to flow.

📄 Free printable: Download the Sound cheat sheet (PDF) — keep it by your child's desk.

Quick summary

Sound is made by vibrations and needs a material to travel through.
It cannot travel through a vacuum like space.
Bigger vibrations are louder; faster vibrations are higher in pitch.
Sound travels faster through solids and water than through air.

Frequently asked questions

How is sound made?

By vibrations — a plucked string, a struck drum or vibrating vocal cords. The vibrations pass through a material to our ears.

Can sound travel through space?

No — space is a vacuum with no particles to carry the vibrations, so it's silent. Sound needs air, water or a solid to travel through.

What is the difference between pitch and volume?

Volume (loudness) depends on the size of the vibration; pitch (how high or low) depends on how fast it vibrates — faster means higher.

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