Balloon rocket

Matthew wanted to make and test out the balloon rocket, basically he likes anything that can 'fly'.

What you need:
2 chairs
String
Balloon
straw
sticky tape


What to do:
Place the string inside the straw then tie the string to two chairs. Blow up the balloon and attache it to the straw using sticky tape, don't let it deflate. When ready, let go of the balloon.

What is happening here?
When the balloon deflates, it pushes air out from the neck. The air pushes the balloon in the opposite direction. 

The science rule: Every action has an equal and opposite reaction.