I guess it is on any topic so you can do a crane using syringes or you can make earth moving around the sun showing circulatory motion.
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U can make a working model on effects of smoking on lungs
by using a bottle, clay and cigarettes.
very simple and very impressive.
u can also see you tube regarding this
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you have given only one idea, you can add more and good ideas
try making an earthquake alarm in which the circuit gets completed as your model shakes, you can also connect a sound alarm in that
Please rate it brainliest if u get some more