Tin-Can Telephone
Professor O will help you learn: Sound travels as vibrations along the tight string from one cup to the other.
⚠️ An adult must pierce the cans, as tin edges and the base holes can be sharp. If using real tins, cover any sharp rim with tape. Paper cups are a safer choice for younger children.
Play through the project step by step, with narration read aloud.
Share this project
Steps
Tap any step to play from there — the narration plays inside the player.
📖 Featured in: Rainy-day activities with no trip to the shops · Junk modelling ideas for Reception and Key Stage 1 · What to save from the recycling for junk modelling
You might also like
Marker-Pen Tie-Dye Shirt
Watching marker ink spread through fabric with a splash of rubbing alcohol shows how liquids carry colour along fibres, making swirling firework patterns.
Junk Drum Kit
Different containers make different sounds — big and hollow is deep, small and tight is sharp.
Tornado in a Bottle
Swirling the water makes a spinning funnel (a vortex) so air can rush up as water pours down.