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初二物理中力臂的教学是个难点，正确找出力臂，是解决杠杆问题的关键．同学们在画力臂方面出现的错误比以往各个知识点所出现的错误都多，归纳起来主要有以下三个方面：一、支点定错．如图（1）a、b中．许多同学误以为C或D是支点．图（2）中误以为0或A为支点．二＿或大8［］阳
The teaching of the power arm in the second day of physics is a difficult point. Finding the right arm is the key to solving the lever problem. The mistakes that the students have made in the painting arm are more than the mistakes that have occurred in previous knowledge points, and they can be summed up in the following three aspects: First, the fulcrum is wrong. As shown in Figure (1) a, b. Many students mistakenly believe that C or D is the pivot point. In Figure (2) mistakenly thought 0 or A as the fulcrum. Two _ or big 8 [] Yang