(1st High School of Igoumenitsa, Greece)

Abstract: This paper presents the ideas/perceptions of B&C class high school students in concepts and laws of the force of friction. All the students had been taught the unit of friction in Class A with traditional teaching methods during the previous school years from the Class A Natural Sciences school textbook “Physics of General Education”. The sample of the research consisted of 224 students from the region of Epirus. The analysis of the answers led to the creation of three categories: a) answers in accordance with the scientifically accepted ones, b) alternative answers, and c) others. The comparison of the results with the equivalent bibliographical ones on students’ ideas/perceptions shows that the findings are in line with those of other researches. From the processing of the answers given by the students it becomes clear that a large number of students have not understood the concepts related to the force of friction and the particularly stable and durable character of their alternative perceptions emerges.