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Two-dimensional collisions of disks and spheres

An oblique collision between two spheres or two disks is usually analysed by ignoring the friction force between the objects. In the present paper, effects of the friction force are examined explicitly to analyse oblique collisions between two circular objects. Two distinct collision modes are described, one where the friction force is due to sliding friction and one where static friction dominates. Experimental results are presented for oblique collisions of two ice hockey pucks. This type of collision could be investigated as a student project, for example by colliding two coins on a smooth horizontal surface or two pucks on an air table.