Duck Cup

How can you make a cup sound like a duck? All you need is a plastic cup, some string, a pair of scissors and a wet cloth!



  • Plastic cup
  • String
  • Scissors
  • Something sharp to make a hole in the bottom of the cup
  • Wet cloth



1. Carefully make a hole in the middle of the bottom of the plastic cup
2. Cut some string and feed it through the hole
3. Tie a large knot at the end of the string
4. Run a wet cloth down the length of the string. What do you hear? Repeat this with just a piece of string with no cup on the end. Do you notice a difference?


The Science

The wet cloth creates friction on the string which produces a vibration. You can hear a faint squeak on the string with no cup on the end. When you add the cup, this amplifies the noise, creating a much louder sound.


Health and Safety

If the children are making their own, they should use children’s safety scissors.