| Summary: | This study deals with the concept of the <i>observer</i> in science education, which is currently significantly diminished at school. In the first part, we review the theoretical perspective of the concept, regarding its historical role in physics knowledge, cognitive aspects of learning and the relevant curricular situation. The second part of the study was devoted to the experiment, which included constructing new materials to facilitate interpretation of physical situations by inertial and non-inertial observers in teaching students in middle schools. The impact of the experimental teaching was assessed by an open questionnaire addressing content knowledge and affective perception of the new material. The significant positive results obtained testify to the feasibility of such innovative teaching. It has a strong advantage in comparison with the regular teaching in the control group. The implication of the study could be significant changes which would upgrade school physics curricula. The explicit inclusion of the inertial forces—instead of banning them, as currently practised—maturates the physics knowledge of school students while resonating with their naive views on the subject.
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