Today is rung 5 of 5 on this topic
Light and sound
Can do: Knows that sound comes from vibration and that we see things because light bounces off them.
Why it matters
These are the first two invisible causes a child can actually test at home, and they build the habit of explaining rather than just describing.
What it looks like when it's wobbly
Thinks we see because our eyes send something out, and that sound is just "noise" with no cause.
⏱️ Two-minute check
"Why can't you see anything in a completely dark room?" and "What's actually moving when a drum makes a sound?"
Solid looks like: Some version of "there's no light to bounce" and "the drum skin is shaking".
The full activity for this topic · 15 minutes
Feel the Sound, Bounce the Light
- 1Stretch cling film over a bowl and sprinkle rice on top. Bang a pan next to it — the rice jumps.
- 2Let them put fingers on their throat and hum. That's the same vibration.
- 3In a dark room, shine a torch at a mirror and bounce the beam onto the ceiling.
- 4Ask them to predict where the beam will land before you move the mirror.
- 5Make shadows and test what changes the size — that's a whole extra lesson for free.
If it's too hard
Just the rice and the humming. Feeling the vibration is the core idea.
If it's too easy
Test which materials block light completely, partly, or not at all, and sort them.
Say this
"Put your fingers on your throat and hum. Feel that? Sound is something shaking."