One of the impulses that initiated the reform at schools on Slovakia were dissatisfying results of our students in multinational testing TIMSS and PISA. A good basis for new educational program in physics for primary schools proved to be an international program FAST which thoroughly applies the constructivist didactic theory. Modern educational programs in natural science aim to achieve scientific and technological literacy. To achieve this aims it is inevitable that the strategies and processes for students to adopt become a part of the educational content and process. Introduction of scientific concepts is a discovery process, applying empirical model of learning. This model is part of research and experiments realization, as well as pedagogical strategy of concepts formulation in physics textbooks. Student’s experience and its transformation on the level of science, it is a key principle of the entire physics program conception for primary schools.