What is newton's scooter?

we did this project in 8th grade. its where you try to make a little car or plane that you build move, but without using gas, explosions, or a few other things i dont remember. but you have to use newtons laws. my partner and i made ours by putting a car on a string and tying balloons to the end, and blowing them up and letting them go. we did this project in 8th grade. its where you try to make a little car or plane that you build move, but without using gas, explosions, or a few other things i dont remember. but you have to use newtons laws. my partner and i made ours by putting a car on a string and tying balloons to the end, and blowing them up and letting them go.