Sound and Vibrations

• Sound is produced when an object vibrates (moves back and forth quickly).
• Plucking a rubber band makes it vibrate, producing sound.
• Touching a ringing bell, you can feel it vibrating.
• Sound can travel through air, so we can hear people talking.
• A drum makes sound because its stretched skin vibrates when struck.

Level 1 — Core idea

Verbal: Every sound starts with something vibrating; the vibrations travel through air (or other materials) to reach our ears.

Symbolic: pluck/strike/blow → vibration → sound travels through air → we hear it

Visual: Stretch a rubber band and pluck it — you can see it shaking (vibrating) while it makes sound.

Level 2 — Going deeper

Think about where you see this idea in daily life at home and school — noticing it around you makes the concept easier to remember.

NCERT anchor

NCERT Looking Around 3 'how we make sounds' activities use rubber bands, bells, and drums to feel vibrations.

You strike a table bell and it rings. Why does it make sound?

Step 1 — Striking makes the bell's metal **vibrate**
Step 2 — Vibrations travel through air to our ears
Answer: **The bell vibrates, producing sound**

You gently touch a ringing tuning fork. What do you feel, and why?

Step 1 — The fork is making sound, so it is moving quickly
Step 2 — This fast back-and-forth motion is a **vibration**
Answer: **You feel a vibration, which is the cause of the sound**

• What causes sound to be produced?
• How can you feel a vibration from a ringing bell?
• Can sound travel through air?
• Stretch: Why does a plucked rubber band stop making sound after a while?

Revision tip: Pluck a rubber band and watch/feel it shake before answering — that shaking is the vibration.

Open the Practice tab for graded questions on Sound and Vibrations.