A Aplica\c{c}\~ao de uma Nova Metodologia de Ensino de F\'isica: O   Aprendizado Colaborativo
  In this paper, we describe the process and difficulties of implementing collaborative activities in an calculus-based introductory mechanics class in Brazil, a class is taught to undergraduate physics majors and pre-service physics teachers. 
Jos\'e Ac\'acio de Barros, Jos\'e Luiz Matheus Valle, Glauco S. F. da   Silva, Jos\'e Roberto Tagliati, Julie Remold
physics.ed-ph