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浮力这一章既是初二物理的重点,也是难点.所以学好浮力这部分内容是至关重要的.在此有这样一个有趣的问题“1牛顿水产生10牛顿的浮力”,通过它可以帮助学生正确理解和掌握浮力这个概念,同时可以引起学习物理的兴趣. 根据阿基米德定律公式F_浮=ρ_液gV_排可知,浮力F_浮的大小是由作为载体的液体的密度ρ_液和被物体所排开的液体的体积V_排(即物体浸在液面下方这部分的体积)所决定的,而跟液体的重量无关;跟物体浸没时物体在液体内所处的深度无关等等.学生对于浮力跟深度无关这一点通过演示实验都比较容易接受,而对于浮力跟液体的重量无关都感到难以理解,往往要同阿基米德定律中所说的“浮力等于物
The chapter on buoyancy is both a focus and a difficult point in the second day of physics. Therefore, it is vital to learn about buoyancy. Here is an interesting question: “1 Newtonian Water Produces 10 Newtons of Buoyancy”, which can help students The concept of buoyancy is correctly understood and mastered, and at the same time can be of interest in learning physics. According to Archimedes’s formula F_float=ρ_liquid gV_row, we can see that the size of buoyancy F_float is the density of the liquid as carrier. The volume of the liquid and the volume of the liquid displaced by the object V_ (ie, the volume of the part of the object immersed in the liquid surface), irrespective of the weight of the liquid; the position of the object in the liquid when the object is immersed Depth is irrelevant, etc. Students are unaware of the fact that buoyancy is irrelevant to depth. They are relatively easy to accept through demonstration experiments, but they are difficult to understand when buoyancy has nothing to do with the weight of the liquid, and it is often the same as the buoyancy equivalent in Archimedes’ law.