Equipment:
- 2x tin cans
- a length of string
- hammer
- small nail
- a buddy to work with
Method
Steps:
- Make a small hole in the end of your tin cans
- Thread the end of the string through the small hole
- Tie a knot in the string so that it cannot be pulled back through the hole
- Pull the string tight between the two cans
- Speak into one can while the other person listens at theirs
- Take turns to speak and listen
- Send messages
- Twang the string and listen
- Draw a set of pictures to show what is happening here
- Add labels to your pictures to show your understanding
Focus Questions
- What does this system need to make the telephone work?
- How is the sound travelling?
- Can you send secret messages?
- What is happening?
- Why does this happen?
- What does this tell us about how sound travels?
Chicken Sounds From a Plastic Cup
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