摘要：In this study, it is aimed to determined and compared high school students’ ideas about momentum and impulse before and after instruction. For this purpose, 26 students were asked open-ended questions. Question 1and 2 are about momentum, question 2 and 3 are about impulse. Consisting of six categories of evaluation categories were created for the analysis of the questions and answer given by the students before and after instruction is placed in this category. After instruction most of the responses to these four questions take part in scientific or scientific fragment categories. Instruction organized according to new program effective to exchange students’ ideas.
