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In our class 3Bs I with my collegue Mr Cesetti have dealt with this routine following the TEAL activity named "Urti e biliardo" (pool and collision).
We have asked our students some questions in order to make them meditate on their thinking.
The experiment in question consisted of making two pool balls, with the same weight, collide calculating the quantity of movement before and after the collision.
we have taken into account that the quantity of movement after the collision resulted in the same in direction a lower magnitude due to the friction.