1. Take one
end of the string and tie it to
a tree or a post.
2. Take the straw and thread
it through the other end of the string.
3. Tie this end to a tree or post in a straight line - like a clothes line. Make sure that the string
is pulled tight.
4 . Move the straw down to one end
of the tied string line.
5. Blow up the balloon and hold
the opening so that the air does not
6. Place the mouth end of the balloon
so that it is at the end near the tree or post.
7. Still pinching the inflated balloon - make sure the balloon
is parallel to the string and straw. Place
two pieces of tape over the straw
and balloon making sure that the balloon
is attached securely.
8. When ready, release the balloon.
balloon and straw take off across
the string until the balloon is
When the balloon is
released the compressed air rushes
out into space and the reaction
is to drive the balloon forward
like a rocket.
Sir Isaac Newton’s
Third Law, “For every
action (force), there is an
equal and opposite re-action."
is a good experiment to do outside on a nice day.