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116问答网 > 1⼀3ml^2是边缘的转动惯量但是为什么前面是1⼀2mgl？？？？这个是中点的话转动惯量不应该是

1⼀3ml^2是边缘的转动惯量但是为什么前面是1⼀2mgl？？？？这个是中点的话转动惯量不应该是

2025-04-07 06:53:36

推荐回答（2个）

回答1：

前面是1/2mgl——这是棒在初始的水平位置所受到的重力的力矩=重力mg与棒中点到转轴的距离L/2的乘积。
根据转动定律，棒所受到的合外力矩等于棒的转动惯量乘以角加速度。于是就列出上述等式，求出角加速度。

回答2：

这是大学物理吧

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