Περίληψη: | The purpose of this article is to understand the reasons for the inertia of the traditional didactic contract that produces, in secondary school, a teaching of physics sciences based on a qualified inductive approach seeking especially the restitution by students with factual knowledge. The analysis of a physics lesson in scientific graduating class about the propagation of a mechanical signal mobilizes tools of the theory of joint action in didactics. It appears, thereby, that the lesson progresses through a series of effects of contract that oblige the teacher to reveal to the pupils the knowledge which she wished to be apprehended by themselves.
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