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初中同学在解答物理题时,由于未弄清题意,审题不细,或由于概念模糊不清而造成解题错误,下面举几例常见的概念性错误.例1 用最小刻度是毫米的刻度尺测得某物体长为5.18厘米,准确值为5.1毫米估计值是8毫米;[正确答案51;0.8]错因:粗心大意,不作精细思考,把“数”和“单位”混为一体.例2 一根铜线和一根镍铬线,长短粗细相同,把它们串联电路里,哪根导线中的电流大?铜线电流大;[正确答案,一样大]
When junior middle school students answer physics questions, because they haven’t figured out the meaning of the questions, the questions are not detailed, or the problems are ambiguous due to the vagueness of the concepts, there are a few common conceptual mistakes. Example 1 The scale with the smallest scale is mm. The length of the object measured by the ruler is 5.18 centimeters, and the accurate value is 5.1 millimeters. The estimated value is 8 millimeters; [correct answer 51; 0.8] Wrong causes: carelessness, no careful thinking, “numbers” and “units” Mixed into one. Example 2 A copper wire and a nickel-chromium wire, the same length and length, which in the series circuit, which wire in the current is large? Copper current is large; [the correct answer, the same size]