This particular book is a valuable aid for students in the third grade of Gymnasium in their effort to understand the world of Physics and prepare for the material of Lyceum. It was written with two goals: 

• To guide children from the initial level of knowledge to the highest level of participation in Physics competitions. For this reason, it contains, in addition to the theory written in detail, numerous solved examples, critical questions, exercises, problems, as well as exceptionally beautiful problems. 
• To be an irreplaceable assistant for the teacher, containing numerous feedback tests, evaluation tests, exams, assignments, and activities. We hope it will successfully lead you on the paths of Physics.