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Use your LEGO to design and build a balloon-powered car. If it doesn’t work the first time, don’t give up! Think about what you can change on your car to improve it.
If you build a LEGO car it won’t be able to move unless a force (a push or a pull) is acting upon it. This could be you pushing it along or putting it on top of a slope and letting it roll down. Another way you can get a car to move is by using wind force, which is made when a balloon loses its air and pushes the car along the ground.