唐僧骑马咚那个咚
幼苗
共回答了22个问题采纳率:86.4% 举报
Fold,cut out or bond together with suitable size paper into rotor type or other shapes of paper dragonfly.Release it from a height of 2 meters,it will fall in a rotating manner and the falling time will be distnctly prolonged.Explore this system in depth,try to determine the parameters for describing this motion process,and optimize the parameters so as to extend the falling time as long as possible.
1年前
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