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新课标全国卷的选择题注重半定量分析和定量计算,通过原始问题来考查考生的能力,难度较大,使考生望物理而生畏.所以考生除了具备扎实系统的学科知识之外,加强解题指导,掌握一些基本的解题方法和原则是很必要的.1常识优先例1如图1所示,一个半球形的碗放在桌面上,碗口水平,O点为其球心,碗的内表面及碗口是光滑的.一根细线跨在碗口上,线的两端分别系有质
The new curriculum standard for the national curriculum focus on semi-quantitative analysis and quantitative calculation, through the original problem to examine the candidate’s ability to more difficult candidates look at the physical and daunting so candidates in addition to a solid system of discipline knowledge, strengthen Problem-solving guidelines and mastering some basic problem-solving methods and principles are necessary.1 Common sense Priority Example 1 As shown in Figure 1, a hemispherical bowl is placed on the table top with the mouth of the bowl horizontal and the point O as its center. Bowl’s inner surface and bowl mouth is smooth. A thin line across the bowl mouth, line ends are tied