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Forces and Motion Science Fair Project

Balloon-Powered Rocket Car

Balloon-Powered Rocket Car | Science Fair Projects | STEM Projects
Have you ever wanted to build a rocket car? With this project, you can! Using a balloon, some pins, and a Styrofoam tray, you can construct a car that rolls across the floor because air is forced to escape through a plastic straw.


The hypothesis is that Newton's Third Law of Motion can be demonstrated with escaping air as the action force.

Method & Materials

You will construct a balloon-powered rocket car by drawing a rectangle and four circles on a Styrofoam meat tray, inflating a balloon and attaching it to a flexi-straw, taping the straw to the car, and pushing pins into the circles and rectangle.
You will need 4 pins, a Styrofoam meat tray, cellophane tape, a flexi-straw, scissors, a drawing compass, a marker pen, a small party balloon, and a ruler.


After constructing the car, you can observe that it rolls across the floor due to the escaping air from the balloon, demonstrating Newton's Third Law of Motion. You can also design your own car and hold car distance trials to measure and chart the distances each car travels.

Why do this project?

This science project is interesting and unique because it allows students to construct their own rocket car and observe the effects of Newton's Third Law of Motion in action.

Also Consider

Experiment variations to consider include using different materials for the car, such as Styrofoam coffee cups, and testing different sizes of wheels.

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

Related video

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