解答有关滑轮组提升重物的问题,要明确相关物理量之间的关系,如s与h;F与G_物和G_轮;v_绳与v_物之间的联系.当题中条件发生变化时,要把握哪些物理量发生了变化,哪些物理量没有改变.按照这种思路去考虑,就能避免在解题中出现错误. Answer the questions about the lifting of heavy objects on the block and pulley, and define the relationship between related physical quantities, such as s and h; the relationship between F and G_objects and G_wheels; and the relationship between v_ropes and v_ objects. When the condition occurs When changes occur, it is necessary to grasp which physical quantities have changed and which physical quantities have not changed. Considering this kind of thinking can avoid mistakes in solving problems.