Competition Problem 3 English Version
They compute a value for the new angle phi when r/R = .75. 1 point
They obtain a valid comparison for F/N and mu. and decide it slips 1
point
In addition, If they loose points due to math mistakes, but they write
a significant part of the "Physical reasoning" part of the solution, you
can award points back (up to 2). Total does not exceed 5 points.
Scoring Rubric:
They demonstrate good reasoning leading to a correct equation for the angle
phi. 3 points
Remove points according to the severity of the error that prevents
a correct equation.