Risultati della ricerca
Anno XLV - n.2 - aprile/giugno 2012 Induzione elettromagnetica: un possibile percorso didattico
Physics textbooks describe electromagnetic induction phenomena with the simple calculation rule called ‘flux law’ but Maxwell’s general law of electromagnetic induction law, based on the vector potential and invariant for Lorentz’s transformations, shows that the induced emf is the consequence of time variations of the vector potential and the motion of electric charges in a magnetic field. […]
Anno XLV - n.2 - aprile/giugno 2012 Quei testi dell’Apocalisse. Legge dell’apprendimento iperbolico
In recent years the knowledge levels in science of freshmen dropped constantly in Italy and in other countries. This might be because the excess of information in today?s secondary school textbooks makes identifying and mastering the important concepts difficult. Results found by different groups that examined pre-university textbooks in a number of different countries are reported. […]
Anno XLV - n.2 - aprile/giugno 2012 Moto di un razzo ad acqua
This article shows how to make equipment for studying the performance of a water rocket, e.g. its acceleration versus air pressure and mass. […]
Anno XLV - n.2 - aprile/giugno 2012 Alla ricerca delle cause del recente riscaldamento globale
2012 is the ‘International Year of Sustainable Energy for all’ but most of the energy we use comes from fossil fuels. We know that increasing the amount of CO2 in the lower atmosphere can trap infrared radiation, increasing its temperature. Climate change has always been a result of natural causes, […]
Anno XLV - n.1 - gennaio/marzo 2012 Tecniche di apprendimento attivo con esperimenti dimostrativi interattivi (Interactive Lecture Demonstrations – ILD) e l’uso di risponditori individuali (clickers)
Most introductory physics students spend the majority of their time in passive and often crowded lectures. Studies show that students learn little in such classes. The results of education research have led to the design of active learning environments (often making use of computer-assisted data acquisition tools). […]
Anno XLV - n.1 - gennaio/marzo 2012 Quanta energia è irradiata scaricando un condensatore?
Reasoning on what happens when connecting two charged capacitors suggests a general procedure for evaluating the energy associated with the propagation of electromagnetic waves. […]
Anno XLV - n.1 - gennaio/marzo 2012 Dispute scientifiche di ieri e di oggi
Reactions to the science of global warming have followed a similar course to those of other inconvenient truths from physics. […]
Anno XLV - n.1 - gennaio/marzo 2012 Molle in serie e in parallelo
Hooke’s Law applied to a number of springs connected in series (same strength) or in parallel (same elongation) suggests a mechanical analogy to the electrostatic behavior of a number of series or parallel connected capacitors. […]