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力の平行四辺形→天秤の原理 resultant force
Author:
Bunryu Kamimura
力の平行四辺形から天秤の原理を導く ①平行四辺形ACDBを作る ②AD//GJ//FKとなる様に天秤を作る ③この天秤が吊り合うことを示す
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