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一條彈弓拉到唔同長度嘅圖解；條彈弓俾人拉得愈長，佢施嚟令自己返去原本長度股力就愈勁。

胡克定律（Hooke's law）係一條物理定律，指出一條彈弓被人拉長或者撳扁咗 咁長嘅位移嗰陣，條彈弓會施 咁多嘅力嚟令自己回復原本長度，即係話，

當中 係一個屬於嗰條彈弓嘅常數，反映條彈弓嘅剛度（stiffness）。個負號表示， 喺方向上同 永遠係相反嘅。

睇埋

source: https://zh-yue.wikipedia.org/wiki/%E8%83%A1%E5%85%8B%E5%AE%9A%E5%BE%8B