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We will explore how a rocket engine works!

Step by Step

Requirements chevron down

  • A balloon
  • A straw
  • A clothespin
  • 5 meter rope
  • Tape
  • Chair
  • An extra person: it is helpful to do this experiment with two people!

Instructions chevron down

 

  1. Thread the string through the straw.
  2. Tie one end of the string to a chair and give the other end to your assistant. The assistant should pull the string tight and keep it under tension.
  3. Blow up the balloon, or ask someone to help you. Do not tie the balloon. Instead, close the opening with a clothespin. If that does not work, pinch the balloon firmly shut.
  4. Use tape to attach the balloon to the straw. Do not tape it too tightly, as the straw needs to slide smoothly along the string.
  5. Just before launch, check that the string is still tightly stretched.
  6. Pull the balloon along the string towards you and count down from 3 to 0.
  7. Release the clothespin: the balloon shoots like a rocket to the other end of the string.

  8. Experiment completed, successful launch!

 

Why does it work?

You have discovered how a rocket works! A rocket is basically a large fuel tank that is set on fire. The gases that are released leave the rocket from the back, pushing it upward. When the air escapes from the balloon, it creates a stream of air that pushes the balloon forward.

Ballonraket