Race Between Two Cards

Two identical coins are glued on two cardboard with the same surface. One of the pieces is at the centre of the cardboard and the other one next to the edge of the other cardboard. We put the two cardboard on a support that we suddenly remove. The two cardboards are in the air at the same time, but the one whose coin is glued on the edge falls faster than the other. Indeed, the weight of the coin places the cardboard vertically and the resistance of the air has little effect on this one. The cardboard which coin is glued at the centre remains horizontal and is halted by the frictions of the air. Production: University of Lille 1 - Sciences and Technologies SEEM Multimedia Service - University of Lille 1 Teachers/ Researcher: Jean-Marie Blondeau, Bernard Bonnel Project coordinator (shooting and editing): Bernard Mikolajczyk Technician: Gerard Destrun Voice over: Alain Nempont Contact: semm@univ-lille1.fr