Sparking Curiosity. Creating Leaders.
Balloon Rocket
Launch a rocket using just air and a balloon! Explore the principles of thrust, propulsion, and Newton’s Third Law while having fun testing different designs and seeing how far your rocket can travel.
Introduction
Balloon rockets are a simple, hands-on way to learn about the forces that make rockets move. By releasing the air from a balloon, you create thrust that propels your “rocket” along a string. You can experiment with balloon size, shape, and even straw placement to see how these changes affect speed, distance, and stability. This project demonstrates key aerospace concepts in a safe and fun way.
Materials Needed
-
Balloon (any standard party balloon)
-
Long piece of string or fishing line
-
Drinking straw
-
Tape
-
Scissors (optional)​
Newton's Third Law
The balloon rocket demonstrates Newton’s Third Law of Motion: for every action, there is an equal and opposite reaction. When air rushes out of the balloon, it pushes backward, and the balloon moves forward along the string. This simple experiment shows how rockets are propelled in real life, using thrust to overcome gravity and drag. Students can also explore how variables like balloon size, shape, and added weight affect speed, distance, and stability, providing a hands-on lesson in propulsion, aerodynamics, and experimental design.
Intructions:
-
Thread a long string through a drinking straw and secure the two ends on anchors like chairs or doorknobs.
-
Inflate the balloon and pinch it but don't tie it. Tape the balloon to the straw so the end points backwards along the strong.
-
Let go of the balloon opening and watch it zoom along the string! Experiment with different balloon sizes, shapes, or straw positions.
Additional Resources
