Abstract
The paper shows how to demonstrate, by means of simple experiments with falling bodies, that the drag force of the environment is proportional to the square of the velocity and how to determine the drag coefficient approximately. It also illustrates how to use ICT tools (video taken with a common camera, Tracker and Excel) to measure and process the results, and points out that the issue of the drag coefficient is not as simple as we often imagine when looking at a classical school formula.