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Phenomena exploration to build the concept of magnetic field flux
No full textElectromagnetic phenomena offer a context in which students could address the investigation of the physical reality using multivariable abstract elements representing theoretical syntesis. The role played by the flux of the magnetic field in that description is pivotal but at the same time its interpretation represents an important learning knot that students had to face. To explore this physical quantity, a computer on-lie Real Time Laboratorial (RTL) activity was developed and proposed to Italian high school students in the framework of the development of vertical Inquired Based Learning path. The formal nature of the magnetic field flux is constructed step by step starting from the exploration of simple hands-on activities on the interaction of magnets with different materials and developed thought measure of magnetic field to reach the interpretation of the electromagnetic induction. A compass as explorer of magnetic properties in the space around a magnet is used to represent magnetic field lines. The identification of the vector nature of the magnetic field distinguishing this entity from a the forces prelude the visualization by means of a flux tubes representation of the magnetic field which is built from the field line representation in a framework in which the role of experiment founded the formal role of the entity and the formal representation and the critical analysis of them provide new more refined interpretative tools that could be applied in different, more general, contexts. The core activities of the investigation of the magnetic field flux is focused on the discussion with students on the experimental explorations of the relationship between magnetic field value and relative tube flux section. The experimental activity and the analysis of the learning outcomes and reasoning that the proposed activities promotes in secondary students will be presented and discussed. Data presented from students referred to four different activities held with different groups of high school students: 1) 5th class of experimental scientific lyceum, 2) 5th class of scientific lyceum; 3) 5th class of a classic lyceum; 4) a selection of the Italian best student coming from all of the 4th and 5th classes of all the Italian high schools. Looking in particular to the role of the angle of attach to flux proposed, it emerge a crucial step in which pupils identify a constant quantity of the system that is related to a multivariable abstract entity which is the flux. In this way the role of the rigor and the inner coherence adopted in the learning path allow students to address the exploration of the phenomenology and its analysis in a systematic way constructing the formal representation of the physical entity involved. © Institute of Mathematics and Physics, Faculty of Mechanical Engineering, Slovak University of Technology in Bratislava
Dialoghi sui fenomeni elettromagnetici con bambini della scuola primaria in un contesto informale
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Metaphors and analogies proposed by perspective primary teachers to support the exploration of magnetic phenomena
Full text linkAnalogies and Metaphors play an important role in primary science education to correlate abstract aspects and lived experiences, providing concrete meanings for pupils. They represent important educational tools that can help young pupils to approach towards abstract physics concepts like those related to magnetic phenomena. In order to improve the competencies of Prospective Primary Teacher (PPT) students related to the use of analogies and metaphors in education, a specific module of formative intervention was developed and propose
Pupils explore magnetic and electromagnetic phenomena in CLOE labs
No full textThe Conceptual Laboratory of Operative Exploration (CLOE) provides an informal context for pupils that stimulates conceptual reasoning and offers anchors for the construction of the first steps in scientific knowledge from the common sense vision. Research based CLOE labs are carried out by a researcher on a specific topic, based on a semi-structured interview protocol, which represents an open work environment through the proposal of everyday life scenarios. Phenomena in everyday situations are explored following sequences of reasonings by means of simple hands-on apparatus in different contexts. A research focused on construction of formal thinking through CLOE allows to identify students' spontaneous ideas and conceptual paths into the evolution of reasoning in the interpretation of magnetic and electromagnetic phenomena. This particular activity was carried out with primary and lower secondary school students (from 6 to 13 years old; from 1 to 8 grade). Starting from the identification and the classification of magnets, students highlighted the presence of a space property described by the orientation of a compass (magnetic field) having as sources both magnetic objects and both an electric current. The quantities involved into the Lenz induction process are individuated exploring the conditions for the generation of an electric motive force, highlighting the transient nature of the phenomena. The task to explain the functioning of an unknown artifact (induced torch) give the opportunity to apply the ideas on electromagnetic induction. Data are collected using personal worksheets and recording of the activity looking in particular to: 1) how an operative exploration may help students to identified and organize electromagnetic phenomena; 2) how the exploration and the comparison between phenomena is useful to help students in the interpretation of artifact; 3) how exploratory elements are reused by students in the interpretation of artifacts
Mathematics as a resource in understanding the peculiar characteristics of magnetic field
No full textDespite that mathematics is the basic language used by physicist to construct formal entities, at high school level sometimes this is poorly implemented, as the case of the
naïve definitions of important entities like the pseudovector (axial vector) and the limited use of the study of the symmetries for example in the analysis of electromagnetic systems. In this paper two simple experimental contexts are proposed in which students investigate the pseudovectorial nature of electromagnetic field vector and a simple formal explanation of its nature starting from the analysis of its behavior
ANIMATE THE FORMAL TOOLS TO RECONCILE THE LOCAL OBSERVATION TO THE STUDY OF MOTION IN PHYSICS
No full textAnimare gli strumenti formali per raccordare l’osservazione locale allo studio del moto in fisica
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