Intermediate
40 mins
Teacher/Student led
+105 XP
Teacher-led from the board — pupils need no device

Sound Is a Wobble

Feel your throat hum, watch rice jump on a drum, and find out: a sound is a wobble that reaches our ears.

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    Observation

    1 - Getting Started ~4 mins

    Illustration for Getting StartedPut a gentle hand on your throat and hum a quiet tune. What can you feel?

    Keep humming. Does the feeling stop when the sound stops?

    2 - What Do You Think? ~4 mins

    Key point

    Our big question today: what is happening when something makes a sound?

    Tell a partner what you think. Then we will try some things and find out.

    3 - Feel the Wobble ~12 mins

    Key point

    We will make sounds and notice what is moving. When the sound stops, notice that too.

    Watch together

    Watch together — drum and rice: watch the rice when the drum is tapped gently.

    Illustration for Feel the wobbleThen at your desks with a partner:

    • Ruler — hold one end firmly so half hangs over the edge. Flick the free end gently. Feel it while it sounds.
    • Elastic band — one of you holds it stretched between two thumbs. Your partner plucks once, then feels the band while it sounds. Then swap.
    • Throat — hum again with fingertips lightly on your throat.

    4 - What Did You Notice? ~3 mins

    Eyes this way. What did you feel? What did you see?

    Tell us about one try: the ruler, the band, your throat, or the rice on the drum.

    5 - See the Wobble ~5 mins

    Look at the drum on the board. Watch the skin shake. What is the same as the real drum we just used?

    Key point

    The shaking we felt has a name: a wobble. Scientists also say vibration.

    Key point

    Sound is what we hear when that wobble reaches our ears.

    Pupil practice · Investigation Journal
    Module 3 · Energy and Forces: Energy in Our Day, Pushes and Pulls, Sound
    Lesson 21 · Sound Is a Wobble
    Download Investigation Journal sheet (PDF)
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