Risultati della ricerca
Anno XLII - n.2 - aprile/giugno 2009 La cosa e la misura
‘A mass hangs from a spring’, ‘Light is pure energy’, ‘Electric charge flows through a conductor’. In each of these sentences the name of an object is substituted by the name of a physical quantity that describes it. We discuss whether such formulations are justified and show that the first sentence is not inadmissible, […]
Anno XLII - n.2 - aprile/giugno 2009 Giochi di equilibrio
Equilibrium is an obvious topic in physics: it is interesting, not too difficult and it has many applications. But, as quantitative experiments are few, it is not always presented in lab sessions. The paper presents a variety of devices on which a problem solving oriented session might be based. […]
Anno XLII - n.3 - luglio/settembre 2009 Un esperimento meccanico ed uno elettrico sul caos deterministico
The inverted torsional pendulum (often used as a tool to study non-linear oscillations and the transition to deterministic chaos) is here compared to an electric non-linear oscillator which shows a quite similar dynamic behaviour: the motion equation of the second system is exactly described by the Duffing equation, […]
Anno XLII - n.3 - luglio/settembre 2009 Il microscopio ottico a proiezione come modello per introdurre la microscopia elettronica in trasmissione
An optical projection microscope is used to introduce highschool students to the working of the electronic transmission microscope. The sequence of the lab activities and computer simulations is programmed in close in analogy with what actually happens when using the electronic microscope, […]
Anno XLII - n.3 - luglio/settembre 2009 Il trasporto dell’acqua fino alla cima degli alberi
The system of conduits found in a tree is far larger and more complex than any human-constructed microfluidic system. […]
Anno XLII - n.3 - luglio/settembre 2009 Immagini fotografiche di una ruota di bicicletta
The analysis of the kinematics of a wheel that rolls on a level ground requires highschool maths. It suggests an easy and interesting lab activity suited to highschool students. […]
Anno XLII - n.3 - luglio/settembre 2009 Un densimetro… ad acqua e zucchero
We propose a simple way to classify bodies of different density, based on the buoyancy of solid bodies in a partially saturated mixture of sugar in water. The experiment requires a cup of water, sugar (or salt) and small plastic bodies with different densities and can be performed in class or given as a task at home. […]
Anno XLII - n.3 - luglio/settembre 2009 Insegnare male la fisica
In a paradoxical mode the author presents a list of suggestions for making the teaching of physics repulsive and ineffective. […]
Anno XLII - n.3 - luglio/settembre 2009 Fisica senza giochi
The author describes a course for Tanzanian teachers of physics and mathematics held in August 2009, the difficulties encountered, the goals achieved and the satisfactions obtained during this extremely interesting experience. […]