Problem P. 4174. (September 2009)
P. 4174. If the sheets of two exercise books, facing each other, are shuffled into each other, and then the two exercise books are pressed together with two fingers, then even an adult is unable to pull the two exercise books apart. What is the reason for this phenomenon?
Deadline expired on October 12, 2009.
Sorry, the solution is available only in Hungarian. Google translation
Megoldás. Sok lap között lép fel súrlódási erő, ezek eredője nagyon nagy lehet.
220 students sent a solution. 3 points: 198 students. 2 points: 5 students. 1 point: 1 student. 0 point: 9 students. Unfair, not evaluated: 7 solutions.