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剛體

剛體粵拼gong1 tai2英文rigid body)喺物理學分析上係指一件喺郁動過程當中唔會變形嘅理想物體。剛體嘅定義特徵係完全唔會變形-無論外界向嚿剛體施幾勁嘅力都好,嚿剛體內部啲粒子彼此之間嘅距離都完全唔會變,或者變嘅幅度細到可以忽略;喺現實世界,冇嘢係剛體-就算一支棒球棍用最精良嘅(一種出嗮名硬淨材料)造嘅都好,「支棍能夠頂得順幾勁嘅力」都實會係個有限嘅數值。

使用

[編輯]

力學工程學上嘅分析好多時會為咗簡單起見,假設分析嗰件物體係剛體,而喺實際應用上,物體郁動嗰陣嘅變形幅度通常都好細,所以呢種假設唔會影響個數學模型嘅準確度。

睇埋

[編輯]
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剛體
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