ESPCI web site
Hugo Lumia et Grégoire Vassal
Problème du Tournoi International de Physique 2023 (Site tournoi français :)
Stuck metallic spheres
Fill a bottle with small metal/plastic spheres with diameters of the same order of magnitude as the size of the opening. Try to pour the spheres out of the bottle by turning it upside down. Similar to pouring salt from small openings, one can see that after a certain time the spheres become stuck and stop pouring out. Investigate the phenomenon. What is the average time it takes before the system becomes stuck ? What bottle shapes can prevent the system from getting stuck ?
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