Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation
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# Problem M. 349. (March 2015)

M. 349. A roll of cello-tape (or any other type of transparent adhesive tape) is placed to a fixed horizontal axle. The end of the tape is pulled vertically downward at some particular magnitude of force. Investigate how the tape rolls down (or breaks) at different magnitude of forces. Find the relationship between the average roll-off speed and the force.

Another type of measurement can also be chosen: tear off the tape at some given speed and investigate the average force applied. (Only one of the two different measurements should be carried out.)

(6 pont)

Deadline expired on April 10, 2015.

### Statistics:

 16 students sent a solution. 6 points: Frim Bálint, Holczer András, Horváth Sebestyén Lénárd, Nagy Gergely. 5 points: Asztalos Bogdán, Boldizsár Bálint, Csathó Botond, Kovács Péter Tamás, Olosz Balázs, Sal Kristóf, Szentivánszki Soma . 4 points: 1 student. 3 points: 1 student. 0 point: 1 student. Unfair, not evaluated: 2 solutions.

Problems in Physics of KöMaL, March 2015