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範例:彈簧鉛直面簡諧運動與力學能守恆[87日大]

一自然長度為12L的彈簧,上端固定,下端掛一質量為m的物體,並使物體在鉛垂方向作簡諧運動。設重力加速度為g,運動過程中彈簧的長度最短時是11L,最長時是15L,則下列敘述何者為正確?(彈簧的質量不計)(A)彈簧的彈力常數是k=mg/L(B)當物體的速率最大時,彈簧的長度是13L(C)物體的最大動能是2mgL(D)當彈簧長度是11L15L時,彈簧的彈性位能相同(E)當彈簧長度是12L14L時,物體的動能相同。[87日大]


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Posted in 彈性位能, 歷屆物理考題.

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