Your balloon powered car demonstrates Newton's 3rd law of motion. Newton's third law states that every action has an equal and opposite reaction. When the air from the balloon goes through the straw, it carries a force. The direction of this force is in the direction of the flow of the air, in your case, to the back of the car. This is force is 'action'. According to Newton's 3rd law, there should be an equal and opposite reaction. The reaction force will then work opposite of the air flow, meaning towards front of the car. This force will cause the car to move forward. So you see, Newton's 3rd law can explain your balloon powered car.
TUTORIAL LINK: https://m.youtube.com/watch?v=A963BG3k_h4
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