Physics is the same: First and often 2nd author did 90% of the work, then comes people who contributed a little, and finally the supervisor/advisor.
However, some conference papers in my field (accelerator physics) have a different scheme of author sorting: First listed is the corresponding author, i.e. the person who actually wrote the paper and did most of the work. Then comes the rest of the people in his/her institution, listed alphabetically. Then comes the rest of the people, sorted first by institution and then by name.