The book is a collection of problems for which there is enough knowledge in the framework of the school curriculum. However, these are not simple tasks. They require a clear understanding of basic physical laws, the ability to apply these laws, and sometimes just ingenuity. All tasks are equipped with solutions, many of which are small studies. For students and teachers of secondary schools, lyceums and gymnasiums, physical circles and electives, as well as for those who are simply interested in physics.