Risultati della ricerca
Anno XL - n.3 - luglio/settembre 2007 Idee per una didattica sperimentale: la reazione alla spinta di Archimede come misura di densità
Among the forces affecting the equilibrium of an object submerged in a fluid, the present work will focus on the impact of the object on the fluid rather than on the buoyancy of the fluid itself. If the former is measured by means of one-pan balance, […]
Anno XL - n.3 - luglio/settembre 2007 Dinamica Stick-Slip: oscillazioni con attrito
A variety of phenomena in which sliding friction between bodies having some degree of elasticity is present exhibit stick-slip motion. We describe a simple device that allows to analyse this kind of dynamics and we present a wide set of possible experimental observations and measurements. […]
Anno XL - n.3 - luglio/settembre 2007 Transizioni di fase e super-raffreddamento con celle Peltier
We propose an apparatus for teaching experimental thermodynamics in undergraduate introductory courses, using thermoelectric modules and a real-time data acquisition system. Although it is low cost, the device provides an easy approach to investigating liquid-solid and liquid-vapour phase transitions and metastable states (supercooling). […]
Anno XL - n.3 - luglio/settembre 2007 Una spazzola che cammina
We introduce a simple homemade toy, which can glide forward with no propellers, limbs, wheels, and seemingly no movement of any kind that can push forward against the ground. The toy arouses the pupils’ interest and their incentive to ask ‘Why’? […]
Anno XL - n.3 - luglio/settembre 2007 Dimostrazioni a basso costo sulla interferenza e la lunghezza d’onda della luce
The article describes some simple low cost experiments with easily available red and green lasers and diffraction gratings. […]
Anno XL - n.1 - gennaio/marzo 2007 Non conservazione della parità (con una Postfazione di A. Piazzoli)
The 1957 Nobel Prize awarded to Tsung Dao Lee and Cheng Ning Yang aroused the interest of the public. The article aims to illustrate the importance of the work of Lee and Yang in a simple way, comprehensible to lay people with little or no knowledge of modern physics. […]
Anno XL - n.1 - gennaio/marzo 2007 Da Leonardo da Vinci alla nanotribologia: storia delle ricerche e delle teorie sui fenomeni d’attrito (Seconda parte)
The most important topics and results of research on friction, from antiquity to now, are outlined: the early laws and theories, from Leonardo to Amontons and Coulomb; the theory of lubrication and the models of rolling friction from 1840 to 1930; […]