Mathematical and Physical Journal
for High Schools
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Problem P. 4106. (November 2008)

P. 4106. A biro (ballpoint pen), which contains a spring, is pressed against a support at the bottom of an inclined plane as shown in the figure, and then suddenly it is released. The table below shows our measured data, the distance covered by the ballpoint pen as a function of the angle of inclination of the plane \alpha:

Using this table determine the initial speed of the biro and the coefficient of kinetic friction between the plane and the biro.

(4 pont)

Deadline expired on December 11, 2008.


138 students sent a solution.
4 points:107 students.
3 points:3 students.
2 points:5 students.
1 point:10 students.
0 point:10 students.
Unfair, not evaluated:3 solutions.

Problems in Physics of KöMaL, November 2008