Un sistema a fotocellule per esperienze di meccanica

This note describes a system based on photogates and interfaced to a PC that can be particularly useful in physics experiments in which the description of objects’ motion is relevant. The PC role is twofold: on one side it is the system timer, on the other it collects, works out and visualizes data on line. An application for the measurement of the dynamical friction coefficient between two surfaces is presented.