My daughter has to submit a Science project for her school fair. Any suggestions?
Potato cannon. Combustion vs air pressure
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This is kind of my teaching area… here are some ideas depending on interest that may/ may have not yet been covered in science class at that age:
Life Science: how many seeds are in different types of fruit (get a few different types of fruit, help cut open, count seeds). Can a plant grow in the dark or does it need light? (Grow 2 of the same, fast-sprouting plant such as Lima beens, one in a closet and one in the sun, water them the same for maybe a week).
Chemistry: How fast does ice melt in different temperatures? (Put one ice cube outside and one inside… can freeze lol-aid instead for visibility).
Physics: anything involving magnets is usually a hit with that age group… child can predict whether certain objects will be affected by a magnet or not and then test a few of them
May need to adapt for level slightly. Let me know if you have any questions… best of luck!
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MRE (meal ready to eat) chemical heater bomb?
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geodesic dome out of newspaper, strength of everyday materials
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Important safety tip: In the state of Texas if you use compressed air - it’s a toy. If you use combustion - it’s a “zip gun” and is illegal.
Cop buddy of mine looked it up for me a few years back while we were building a device to deploy wire antennas for ham radio. Things could have changed of course.
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What if it is neither - but still blows the bottom out of a 2L soda bottle?
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Then you have a design problem… 
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What are they interested in? work with their interests
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Wow.
We broke the law a LOT when we were “kids”…(<30 linear Earth Years)
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