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Balloon and nut experiment

You will need:

 
  • 1 balloon and an 8mm metal nut

Instructions

 
  1. Insert the nut inside the balloon.
  2. Blow up the balloon and tie it.
  3. Hold the balloon as per the video and gently swirl the balloon around in a circle.
  4. The faster you swirl the balloon, the higher the pitch!

This experiment works due to the corners of the nut vibrating the balloon. The faster the vibrations, the higher the pitch. It also demonstrates rotational inertia, whereby an object with sufficient momentum will tend to speed around the outside of a circle due to the centrifugal motion of the spinning circle... i.e. the nut tries to escape out of the balloon in a straight line but the balloon's shape forces it to travel around in a circle.

Easy and fun science!

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