浮力计算问题是初中物理的一个难点，是中考试题的一个热点．它涉及到的知识有：分析物体受力、密度、重力质量的关系、阿基米石原理和物体浮沉条件导．此类题的解题思路是：首先分析物体的受力情况，找出这些力的等量关系，然后列方程或方程组，即可求解．下面结合中考题分三 The buoyancy calculation problem is a difficult point in junior high school physics, and it is a hot spot in the middle school exam. The knowledge involved includes: analysis of the relationship between the force, density, and gravity quality of the object, the Archimedes principle, and the floatation condition of the object. The problem-solving ideas for such questions are: first analyze the force conditions of the objects, find out the isometric relationships of these forces, and then list the equations or equations to solve them. The following combination of three questions in the exam