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Marvin and Milo

Explore physics the exciting way, by trying out a simple and fun experiment. This month, Electric Slime Don't forget to check back next month for the next edition...

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What you need

  1. a drinking straw - cut in half
  2. a balloon
  3. a long piece of string
  4. a clothes peg
  5. sticky tape


  1. Blow up the balloon and peg the neck to keep the air in.
  2. Thread the straw with the string and then tape it lengthways to the balloon.
  3. Tie the string across the room.
  4. Now unclip the peg!

Results & explanation

As the air rushes out it pushes back on the balloon propelling it forward.

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