The balloon car works according to Newton's Second Law of Motion, which states that if an unbalanced force is applied to an object, the object will accelerate. In the case of the balloon car, the unbalanced force is the force, with which air under high pressure that is trapped inside the balloon, escapes out.
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- Gather the materialsCollect a strong balloon, a milk carton, two drinking straws, four spools for the wheels and straight pins.
- Build the body of the carWash the milk carton and then��cut the top off. Cut the carton along the line dividing the narrow sides in halves. Cut a small opening for the balloon at��the bottom of the carton. Experiment with the size of the opening so that the deflating balloon does move the car along. Put the balloon through the hole so that it is��resting on the carton with the end sticking out.
- Attach the wheelsMake hole in the sides close to the bottom for the axles. Insert the straws into the holes. Put four spools on the ends of the straws on the outside. Close the straws with pins so that the spools stay on.
- Make the car moveBlow up the balloon, let it go and watch the car move.