Yuliana2013-07-022013-07-022013-07-02http://repository.unri.ac.id:80/handle/123456789/4055Pengaruh Model Problem Based Instruction Dan Motivasi Belajar Terhadap Hasil Belajar Fisika SiswaLearning which is dominated by discourse method cause active role and student’s studying motivation in learning are very low and the effect on student learning outcomes. This research aims to know : (1) The differences of physics learning achievement among students that follow Problem Based Intruction (PBI’s model) with students that follow conventional learning. (2) The differences of physics learning achievement among students that have high physics learning motivation with students that have low physics learning motivation. (3) Interaction between learning model and physics learning motivation towards physics learning achievement. Research population is 96 students of class XI science of senior high school 01 Tanah Merah. There are 64 students are chosen as research sample those are divided becomes two PBI and conventional class. Research form that is used in this research is an instrument method with 2 x 2 factorial design. Data collection instrument is a test of learning cognitive achievement and questionnaire motivates to learn physics. The results of analysis points out that: (1) There was a different of physics learning achievement of students that follow PBI model with students that follow conventional learning with F = 5.918 and significant’s number 0.018 (sig <0.05). (2) there was a different physics learning achievement of students that have high physics learning motivation with students that have low physics learning motivation with F = 19.472 and significant’s number 0.000 (sig <0.05). (3) There was no interaction between learning model and learning motivation towards physics learning achievement with F = 0.127 and significant’s number 0.723 (sig> 0.05), 95% confidence levelen-USPhysics Learning Achievement,Physics Learning Motivation,PBI Model,Rigid Body Balance.student Paper Post Degree