Articoli rivista
Note di laboratorio
Anno L - n.4 - ottobre/dicembre 2017 Il pendolo fisico: teoria, simulazione, esperimento
We propose a new tool for laboratory curricula based on computer-aided data acquisition and analysis. A pendulum coupled to a low-friction rotary sensor offers variable length, variable mass, and two different kind of damping torque: “dynamic friction” (almost constant) and “viscous” friction proportional to the angular velocity. […]
Anno XLIX - n.3 - luglio/settembre 2016 Il pendolo semplice
You can measure both the period and the amplitude of a simple pendulum “on the fly”, i.e. while it is swinging and slowing down. This was implemented years ago using a photogate connected to the serial port of a personal computer (which made the time measurements). […]
Anno XXVI - n.2 - aprile/giugno 1993 Il valore efficace della corrente alternata
This article describes an experiment to show the reason why alternating currents are rated according to their heating power (for sinusoidal currents, the r.m.s. value). The luminosities of a 6V filament lamp are compared when it is powered by a battery and by a transformer, […]
Anno XLIV - n.3 - luglio/settembre 2011 Immagini dall’invisibile
The students are guided to take infrared photos with a modified computer webcam, and to understand why on the monitor figures can be shown, which are invisible for the eye. […]
Anno XLIII - n.2 - aprile/giugno 2010 L’analogo rotazionale
With an educational purpose, the analogy between rotational and translational quantities is explained by comparing the behaviours of a flywheel and of a trolley moving along a rail. The inertia of the two compared systems is measured in the same framework. […]
Anno XLVI - n.1 - gennaio/marzo 2013 L’anello saltatore e nuove storie
The Thomson ring experiment is revisited obtaining higher and higher jumps. The ring’s inductance and the phase lag between the primary magnetic flux and the current are determined using a new procedure. New configurations that produce an electromagnetic cannon that fires aluminium disks are presented. […]
Anno XXX - n.3 - luglio/settembre 1997 L’attimo fuggente: ovvero come verificare la rotazione della Terra in meno di venti minuti
The rotation of the Earth produces an effect on the behaviour of a sufficiently long pendulum, as in Foucault’s experiment in 1851. This article illustrates an easy method to measure the Earth’s angular velocity with acceptable accuracy and in less than 20 minutes. […]
Anno XXIX - n.3 - luglio/settembre 1996 L’emissione di luce della lampadina da bicicletta
A series of three simple experimental activities with bycicle lamps allows a determination of the temperature of the filament, an evaluation of the light emission of the lamp. and an examination of the law for the dependence of the illumination on the distance from the source, […]
Anno XLIII - n.3 - luglio/settembre 2010 La conservazione dell’energia nel tiro con l’arco
The article describes a simple but effective experiment on energy conservation. The experiment was performed in the school physics lab using the Tracker program and an archers’ bow. […]
Anno XXXI - n.1 - gennaio/marzo 1998 La fisica per…volare
Home-made one-stage, two-stage and three-stage water rockets were launched at an exhibit on “Physics for… flight”. The design details of the two-stage rocket are described. […]