1问题提出人教版新教材“力的合成”一节中,我们通过实验得到分力与合力的运算遵循平行四边形定则,紧接着课后的“问题与练习”第4题(人教版高中物理必修1第64页)中辨析分力与合力的关系.大部分学生只能凭自己的感觉来判断,却难以让自己心悦口服;少数学生试探着用平行四边形定 1 questions proposed PEP new teaching material “synthesis of force” section, we get the experiment through the experiment of component force and resultant force follow the rules of parallelogram, followed by the “problem and practice” after class Question 4 (PEP High school physics compulsory 1 p. 64) analysis of the relationship between force and force.Most students can only judge by their own feelings, but difficult to make their own heart and mouth convinced; a few students to explore the use of parallelogram