Make a balloon Rocket

 Balloon Rocket

 You Need ~

1 - A Balloon 

2 - A String(2 - 4 meters )

3 - Straw 

4 - Tape

 For Experiment ~

 1 - Tie the one string to some thing.

2 - Put the other end of the string through the straw. 

 3 - Blow up the balloon and do not tie it's end.

4 - Now attach the balloon to the straw with the help of tape and leave the balloon.

                     Now see the magic  

Why does it happens ? 

It happens due to Newton's third law of motion. Which states if two bodies exert forces on each other , these forces have the same magnitude but opposite directions. It is also called action and reaction forces.

So, this was a simple experiment to demonstrate Newton's third law of motion.