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题目:如图1所示:一根均匀的杆子长为L米,重为G牛顿,搁在地上,一端不动,人从一端慢慢抬起过程,则人对杆的作用力如何变化? 分析:该题是关于杠杆的平衡问题,且杠杆并非是静止情况的平衡。而是属于运动中的平
Topic: As shown in Figure 1, a uniform pole is L meters long and weight is G Newton. It is resting on the ground and one end is not moving. People slowly lift the process from one end. How does the person’s force on the pole change? Analysis: The question is about the balance of leverage, and leverage is not the balance of a static situation. But it belongs to the level of sports