"Problem-based learning" (PBL) is one of an innovative learning model which can provide an active learning to student, include the motivation to achieve showed by student when the learning is in progress. This research is aimed to know: (1) differences of physic learning result for student group which taught by PBL versus expository learning; (2) differences of physic learning result for student who has a different motivation to achieve; (3) interaction effect of PBL strategy versus learning strategy and motivation to achieve toward physic learning result. For knowing motivation effect and learning model toward improvement of physic learning result for student class XI is using research method by doing Analysis Path. The result research showed that early capability of student in physic science is insignificant influenced for student's physic learning result and the examination conducted has evidenced that giving PBL model can improve significantly the physic learning result for student class XI. The research concluded that giving PBL model is able to improve the learning motivation of student in class XI significantly.