碰撞（英文：collision）係指兩件物體喺相對短嘅時間之內接觸、並且對對方施力嘅一件事件。喺古典力學上，碰撞可以想像成動量嘅轉換。
物理分析
電腦模擬
内文：碰撞探測
視像遊戲成日會用到碰撞探測呢種演算法，嚟達致迫真嘅虛擬世界。
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