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力平衡與自由體圖。
用力平衡的兩個條件與自由體圖，把「物體為什麼站得住」變成能算出鋼索張力與支承反力的工程工具。
從單體平衡升級到系統分析：用內力切片、桁架節點法與截面法、框架拆解與摩擦模型，追蹤結構內部的力流。
