Collisions of Coins

This paper addresses a popular topic in science teaching and competitions for primary secondary school students. Experiments with colliding coins are relatively easy to perform therefore lessons. We used the idea competition we organized pupils aged 6 13 years. The is based on few experiments that participants have carry out before competition. Some years ago, 10- 11-year-old had experiment coins. These were 1-, 10-, 20- 50-euro cent (see Fig. 1), but can also be carried quarters dimes. simple elastic collisions some obvious profound outcomes, which will described below. Even if bodies moving fast collision itself an instantaneous event, it possible reconstruct trajectories from known initial final positions of At end this paper, present set problems given