在物理练习中,要重视对学生的论证和估算能力的训练。通过论证,可以提高学生思维的逻辑性,表述的条理性,运用数理知识的灵活综合性。学生在问题的估算训练中,能学会设计解题方式,选取合理的有关数据和进行必要的运算,提高对结果是否合理作出判断的能力。在此列举几个具体例题,供同志们教学中参考。例1:图1中电池ε=3伏,r=5欧,支架cdef水平放置,导体ab长l=10厘米,可 In physics practice, emphasis should be placed on training students’ ability to demonstrate and estimate. Through argumentation, we can improve the logic of students’ thinking, formulate the rationality, and use the flexibility and comprehensiveness of mathematical knowledge. Students in the estimation training of the problem can learn to design problem solving methods, select reasonable relevant data and perform necessary calculations to improve the ability to judge whether the results are reasonable or not. Here are a few specific examples for reference in the teaching of comrades. Example 1: In Figure 1, the battery ε = 3 V, r = 5 ohms, the bracket cdef is placed horizontally, and the conductor ab is l = 10 cm long.