The method of determining the semantic proximity between the topics of the school physics course for grades 10-11 is considered in order to identify intra-subject relationships. For each pair of topics, the proximity cosine measure of key concepts and Dice measure, are calculated. The computer program written in ABCPascal was used, which sequentially iterated through the terms from the file t1.txt and compared them with each term from the file t2.txt. This allowed us to calculate the strength of the semantic connection between any two topics. The logical connection between some concepts is taken into account. A graph has been obtained showing the connections between 22 topics of the school physics course.