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1 问题一根粗细不均匀的木杆AB长5m,重心O距A端2m,若将木杆从O处锯开截成AO、OB两段,哪一段重些?为什么?2 定性分析 许多参考答案是这样解释的:如图1所示,设截开后的两段分别重G1和G2,重心分别在O1、O2处,在截断以前以O为转轴,将木杆支起,则木杆平衡。根据有固定转轴物体
1 Problem An uneven and thick wooden rod AB is 5m long, and the center of gravity O is 2m away from the A end. If the sawdust is cut from O to AO and OB, which section is heavy and why? 2 Qualitative analysis Many references The answer is explained as follows: As shown in Figure 1, the two segments after the cutoff are respectively weighted G1 and G2, and the centers of gravity are respectively at O1 and O2. Before the truncation, O is taken as the rotation axis, and the wood is lifted, and then the wood is balance. According to a fixed axis object