Risultati della ricerca
Anno XXX - n.2 - aprile/giugno 1997 Trasformazione termodinamica isoterma on-line: un’occasione per discutere la realizzazione e la taratura di un trasduttore di volume
This paper presents a simple educational on-line experiment about gas (air) transformation. This experiment was performed using an intelligent serial interface (ULI) and a volume transducer designed for this purpose. The paper is divided into two parts: the first explains the design and the calibration of the volume transducer, […]
Anno XXX - n.2 - aprile/giugno 1997 Misure di momenti d’inerzia
The inclined plane is used to evaluate, on the basis of. energy conservation, a moment of inertia. In a first step the coefficient of rolling friction is found; finally, using simple experimental equipment the purpose is achieved. […]
Anno XXX - n.2 - aprile/giugno 1997 Moto di una goccia d’acqua in olio d’oliva
The falling motion of a drop of distilled water inside a transparent graduated cylinder containing domestic olive oil was studied. The results of the measurements taken were worked out so that a direct proportionality between the velocity of the drop and the area of its maximum cross section could be verified. […]
Anno XXX - n.2 - aprile/giugno 1997 Lo spessore di una bolla di sapone
Measuring the thickness of a soap bubble is an intriguing problem that can be solved – at least with respect to the order of magnitude – with scales of 0.01 grams sensitivity (or better). Solving this problem at secondary school level and up is a motivating activity that requires the students to concretely exercise their inventiveness. […]
Anno XXX - n.1 - gennaio/marzo 1997 Dall’universo delle leggi naturali al mondo dei processi evolutivi
Until the nineteenfifties the general aim of science was the search for universal natural laws. In the sixties a radical change took place: advanced scientific research in many traditional subjects started to investigate the evolution of complex systems and of unpredictable and unrepeatable processes. […]
Anno XXX - n.1 - gennaio/marzo 1997 Difficoltà di apprendimento in cinematica di studenti del I anno del Corso di Laurea in Matematica
The skills of freshmen mathematics majors, in interpreting graphs of basic mathematical functions, kinematical graphs and the language of motion were investigated by means of three multiple choice questionnaires with open comments. The unidimensional analyses of each student’s answers and their correlations show context-dependence of skills: in particular the malhematical abilities are not entirely transferred to the physics context. […]
Anno XXX - n.1 - gennaio/marzo 1997 Gli studenti e l’energia
An open questionnaire on various aspects of energy, including phenomena involving heat, was administred to 6 classes of Italian 15 to 18 year-old students having different curricular exprerience in physics, attending different upper secondary schools. In this paper we discuss the answers in depth against the well known conceptual difficulties of energy, […]
Anno XXX - n.1 - gennaio/marzo 1997 Esperimenti a sorpresa con lattine e bottiglie di plastica
Objects easy to find and to manipulate (as plasticbotttes and tins) are used here to make expreriences aiming at producing a sence of surprise and delight in students, to stir their interest, get them to repat the experiences gone through, interpret the physical meaning and plan new ones. […]
Anno XXIX - n.4 - ottobre/dicembre 1996 Universo come oggetto fisico
Philosophers and scientists of antiquity used to speak of material things or bodies, by taking for granted that world was naturally divided into separate objects. Probably that notion is due to the fact that we are living in a comparatively cold sur-rounding (the surface of the Earth), […]
Anno XXIX - n.4 - ottobre/dicembre 1996 I cambiamenti concettuali nella chimica dopo l’avvento della meccanica quantistica
Although the methods of quantum mechanics may be usefully employed in studying the physics of molecules, they are unable to solve some typical chemical problems such as predicting the outcomes of new synthetic processes. The reason for this is the lack of a satisfactory quantum mechanical description of the time evolution of transformation processes in complex systems. […]