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The textbook is compiled in accordance with the current physics curriculum for the 9th grade of secondary schools, taking into account the latest changes and contains tasks differentiated by three levels of difficulty.

The collection is designed to be as convenient as possible for teachers and students. Examples of solving problems are given; answers to most problems are given, as well as selective instructions and solutions. Self-check tests and answers to them are included. The presence of the same type of tasks allows for an optimal selection of tasks for homework and independent work. Problems for the curious will help students to test the depth of their knowledge and prepare for physics competitions. Intended for students of 9th grade of general secondary education institutions and physics teachers.