Precursor Model and Preschool Science Learning About Shadows Formation

Delserieys, Alice; Jégou, Corinne; Boilevin, Jean-Marie; Ravanis, Konstantinos

doi:10.1007/978-3-031-08158-3_5

Cited by 1 publication

(2 citation statements)

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“…Before each experimental activity, the teacher can proceed by using the precursor model ,, to make the didactic game more informative. In order to identify the initial representations of the students and build a scientific model about the concept of relative density, the strategy “Prediction-Observation-Interpretation” is then used, which is divided into these five steps: Prediction; Experimentation; Guided observation; Formalization of the results drawn from the observation in relation to the prediction; Collective interpretation and construction of knowledge. …”

Section: Methodsmentioning

confidence: 99%

“…Before each experimental activity, the teacher can proceed by using the precursor model 29,30,33 to make the didactic game 23 more informative. In order to identify the initial representations of the students and build a scientific model about the concept of relative density, the strategy "Prediction-Observation-Interpretation" is then used, which is divided into these five steps:…”

Section: Stages Of the Experimentsmentioning

confidence: 99%

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Proposal for a Didactic Tool on Teaching Practices Related to the Selective Sorting of Plastic Waste According to Relative Density in High Schools: Case Study in Burkina Faso

2023

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The concept of relative density is introduced in the middle school and high school curricula by an intuitive approach based on the phenomena of immersion and flotation. In high school, the same concept is taught as the ratio between the masses of two bodies of the same volume. This dichotomy of the concept of relative density between the two educational cycles, separately approached, induces initial representations that can constitute epistemological obstacles for its conceptualization and scientific understanding. This study proposes an interdisciplinary approach between chemistry, physics, and mathematics, combining “intuitive understanding” and “mathematical formalism”, with the aim of evolving intuitive perceptions toward a scientific understanding of the concept of relative density, based on the sorting of plastic waste. After establishing the conditions of buoyancy, immersion, and sinking, this approach highlights the existence of several types of plastics and their relative density based selective sorting. This experimentation on the buoyancy of solutions on each other and of solids in solutions provides chemistry and physics teachers with an experimental didactic tool to support their interventions in the teaching/learning process of the concept of relative density. This didactic tool has been proven fruitful for a better understanding of the concept of relative density.

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