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Calculating and Understanding: Formal Models and Causal Explanations in Science, Common Reasoning and Physics Teaching

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Abstract

This paper presents an analysis of the different types of reasoning and physical explanation used in science, common thought, and physics teaching. It then reflects on the learning difficulties connected with these various approaches, and suggests some possible didactic strategies. Although causal reasoning occurs very frequently in common thought and daily life, it has long been the subject of debate and criticism among philosophers and scientists. In this paper, I begin by providing a description of some general tendencies of common reasoning that have been identified by didactic research. Thereafter, I briefly discuss the role of causality in science, as well as some different types of explanation employed in the field of physics. I then present some results of a study examining the causal reasoning used by students in solid and fluid mechanics. The differences found between the types of reasoning typical of common thought and those usually proposed during instruction can create learning difficulties and impede student motivation. Many students do not seem satisfied by the mere application of formal laws and functional relations. Instead, they express the need for a causal explanation, a mechanism that allows them to understand how a state of affairs has come about. I discuss few didactic strategies aimed at overcoming these problems, and describe, in general terms, two examples of mechanics teaching sequences which were developed and tested in different contexts. The paper ends with a reflection on the possible role to be played in physics learning by intuitive and imaginative thought, and the use of simple explanatory models based on physical analogies and causal mechanisms.

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Notes

  1. A. Comte (1830) Cours de philosophie positive, Paris, Rouen Frères, Tome 2, 28e leçon, pp. 435–436 e 454. “Tous les bons esprits reconnaissent aujourd’hui que nos études réelles sont strictement circonscrites à l’analyse des phénomènes pour découvrir leurs lois effectives, c’est-à-dire leurs relations constantes de succession et de similitude, et ne peuvent nullement concerner leur nature intime, ni leur cause, ou première ou finale, ni leur mode essentiel de production. … Toute hypothèse scientifique, afin d’être réellement jugeable, doit exclusivement porter sur les lois des phénomènes, et jamais sur leurs modes de production.”

  2. However, in the same paper, Heisenberg uses expressions that clearly indicate a causal connection, even if in the presence of a certain indeterminacy of some dynamic quantities. Referring to the Compton or photoelectric effect, he writes: “When a light quantum that hits an electron is reflected or diffracted from it and then, again refracted through the microscope, it provokes the photoelectric effect"; and "Of such light a single quantum is enough to hurl the electron outside of its orbit”. It seems to me that some physicists tend to generalize in a hurried and exaggerated way. Starting with some results of quantum physics that are in contrast with some characteristics of causality for some situations, they arrive at general philosophical conclusions.

  3. “Realism is… A doctrine according to which being is independent of the knowledge that conscious subjects may have of it at a given time: esse is not equivalent to percepi. Idealists hold that the intellect knows only its own states: see the commentaries on contemporary physics, which deny the existence of any given external to our representations (to measurements made by observers). Realism and idealism are opposed term for term, each asserting what the other denies. The first posits that thought is inside the being; the second posits that the being is contained in thought” (Largeault J. “Réalisme”, Encyclopaedia Universalis 8, 2002).

  4. It is possible to compare these three types of physical explanation to three of the four kinds of causes indicated by Aristotle (350 B.C.). The efficient cause, "the causes whence the principle of change occurs, all that acts". The material and formal causes, “the causes out of which, of these some as substrate [material], others as concept [formal] e.g., "the letters of syllables, the material of man-made objects, fire and other elements of bodies, the parts of the whole, and the premises of the conclusion.” Aristotle speaks also about reciprocal causes, which act "as fatigue causes vigor and vigor, fatigue". In Physics, book II (B), 3.

  5. Here it seems me that the author commits a rather common error in the interpretation of the laws of co-existence (or formal laws). An equation of the type pV = nRT represents a relationship at a given time between the indicated quantities for an ideal gas in a state of equilibrium. However, the author thinks that the equation further asserts that if at a given time the pressure varies in a region of the gas, at the same time the temperature and/or density will vary so as to maintain the relationship continuously valid. To the contrary, this is not in fact the case. The law establishes a relationship between quantities for a state of equilibrium. If something changes in a part of the gas, the gas is no longer in equilibrium; therefore the equation is no longer applicable. It only says to us that if and when a state of equilibrium is re-established, the indicated quantities will assume the values necessary to satisfy the equation once again. The passage from the initial to the second equilibrium state happens in a finite time and as a result of local interaction processes in the situation of non-equilibrium. The same reasoning holds good for Coulomb’s theorem of electrostatics E = σ/ε, to which the author also makes reference.

  6. This fact is reflected by the various other names attached to this view, e.g. “semantic view” (in contrast to the linguistic-syntactic approach of the statement view), “non-statement view”, “model-theoretic view”, “structuralist” (see Develaki 2007; Grandy 2003).

  7. For example, a special issue of the journal Science & Education was recently devoted to this subject: Science & Education (2007), 16 (7–8): 647–881, Special issue: Models in Science and in Science Education.

  8. It could be objected that the question is a trap question, because of an abrupt change of explanatory level, passing from a macroscopic and phenomenological description to one microscopic which refers to fundamental theories. However, short talks, focusing on the contact interaction between water and ear, had been sufficient for the teachers who answered the question to understand their error. This confirms that it was a customary and automatic reasoning scheme and logical short circuit, therefore really representing a spontaneous tendency of thought.

  9. See for example the books Matthews (1994) and McComas (1998). The journal Science & Education published many articles on these themes, as an example a recent issue is dedicated to the teaching of "nature of science" (2008, Vol. 17, n. 2–3, Special Issue: Teaching and Assessing the Nature of Science). In USA, the National Science Education Standards (http://www.nap.edu/readingroom/books/nses/overview.html) and the Standard for Science Teachers Preparation (http://www.nsta.org/pdfs/NSTAstandards2003.pdf and http://www.msu.edu/~dugganha/NOS.htm), include a section dedicated to “Nature of Science”.

  10. This is not always what happens. For example Guilbert and Meloche (1993), hold that many teachers have what they term an “empiricist-realist” conception of science. This supposedly ingenuous, antiquated view involves, among other things, the myth of the progressive construction of knowledge, and the idea that science concerns the description of the world as it really is: "it seems, according to some students, that it is even possible to distinguish the true from the false". Against this conception, these authors counter that students should be led to a subtle, modern constructivist model, according to which theories are merely speculative constructions allowing a more systematic collection of observations, and reality does not exist independently of us. It is odd that precisely the authors who support instrumentalist and relativist conceptions, and who maintain that true or false, better or worse theories do not exist (each one with its own field of validity and effectiveness, depending on context and aims), at the same time introduce their own conception as the proper and correct epistemological model, and contrast it to others denigrated as ingenuous and antiquated. If no scientific theory is better than the others and there is no truth to discover, then to be consistent, epistemological theories as well would have to be considered all at the same level, with no one better than others.

  11. I. Newton, Philosophiae Naturalis Principia Mathematica, book I, section I, especially the final Scholium. The adjective "vanishing" and the verb “to vanish” (evanescens—evanescentes and evanescere, in Latin) are also attributed by Newton to parallelograms, angles, segments, arches, triangles (cf. Lemmas III, VI, VII, VIII, XI etc.).

  12. Anaxagoras, Greek philosopher (500–428 B.C.): “In his treatise On Nature, he explains the origin of bodies without positing elements like water, fire, etc., but by means of homeomeries (a term introduced by Aristotle): material particles that join together in order to form the bodies but which, in contrast to atoms, have the same qualities as the bodies that they constitute” (Durozoi G. & Roussel A. Dictionnaire de Philosophie, Paris, Nathan, 1997, pp. 19–20).

  13. Arons (1990, p. 64) thinks that “Students need explicit help and guidance in learning to visualize effects that elude direct sense perception. The deformation of apparently rigid objects in the context now under consideration is usually the first opportunity in a physics course, and its importance should not be underestimated. Later, such visualization is essential to understanding what happens…” in many physical situations.

  14. Duhem develops many examples to demonstrate that the first typology supposedly prevails among the French (and Germans), and the second among the English (apart from Napoleon, who is classified among the second category). In particular, he strongly criticises the exaggerated details of mechanical models elaborated in that period to explain electric phenomena: “the theory of electrostatics constitutes a set of abstract notions and general statements, expressed in the clear and precise language of geometry and algebra, connected by the rules of a strict logic … this set totally satisfies the thought of a French physicist… It is not the same for an Englishman; these abstract notions do not satisfy his need to imagine concrete, material, visible things… It is in order to satisfy this need that he creates a model… The use of similar models… is a constant in English physics; some make only a moderate use of these models, others appeal to them at each step. Here is a book that aims to expound modern theories of electricity; we find only ropes that move on pulleys… tubes that pump water… cog-wheels that mesh into one on another; we thought we were entering into the calm and ordered realm of the deductive reason, and we find ourselves in a workshop.” The book to which Duhem refers, published in French translation in 1891, was obviously of an Englishman, O. Lodge.

  15. The distinction must be considered more operational and didactic (intuitive?) than psychological and theoretical, because a rigorous distinction between intuitive and analytical knowledge presents many difficulties and “it is not even clear what we mean by intuitive knowledge” (Bruner 1963). In the same book, Bruner gives a short definition of intuition: 'the intellectual technique of arriving to plausible but tentative formulations without going through the analytical steps by which such formulations would be found to be valid or invalid conclusions'.

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Besson, U. Calculating and Understanding: Formal Models and Causal Explanations in Science, Common Reasoning and Physics Teaching. Sci & Educ 19, 225–257 (2010). https://doi.org/10.1007/s11191-009-9203-9

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