The members of the Canadian team this year were: Henry Wu from University of Toronto Schools, ON; student of Shawn Brooks, Chris (Yuan Qi) Ni from A.Y. Jackson Secondary School, ON; student of Gavin Kanowitz, Lovett Antonio Molina from Ecole Sainte-Anne, NB; student of M. Andre Martin, Pasindu Muthukuda from Burnaby Central Secondary School, BC; student of E. Byman, Andrew Jinwook Kim from University of Toronto Schools, ON; student of Shawn Brooks. The team leader was Dr. Andrzej Kotlicki (UBC), Director for the Canadian Physics Olympiad Program.
The following is a list of problems from previous olympiads, sorted by topic. The rating illustrates how instructive the problem is, and the length refers to how long solving it takes. Hard problems aren't necessarily long and vice versa! Keep in mind that these ratings are subjective. One may find an 'easy' problem to be extremely challenging while a 'hard' problem to be trivial.
Here is an arguably exhaustive list of viable problems, covering most topics that will show up on the actual IPhO competition.
A. IPhO formula sheet:
B.