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Creative Task


EXPERIMENT 5: How does a balloon rocket work?

You will need: -

  • A straw
  • A balloon
  • Sellotape
  • Thin string or thread that the straw will slide along easily


  • Cut a 10cm piece of straw
  • Thread it onto the string and tie the string between two objects (between the back of two kitchen chairs would be good)
  • Blow up a balloon
  • Holding the end closed, sellotape it to the straw (you might need someone to help you do this)
  • Release the end of the balloon and watch what happens
  • You could try racing two balloons on two pieces of string



  • In which direction do the balloon and straw move when you release the balloon?
  • In what direction does the air move when it leaves the balloon?
  • Why does this happen?
  • How could you make the balloon and straw move faster?
  • Which famous scientist described this process in his third law of motion?