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Abstract

This study was purposed to determine the mastery and difficulty concepts of Senior High School students in Newton’s law. The study was employed a descriptive analysis to find the mastery and difficulty concepts of 34 students of senior high school class X-MIPA of SMA Negeri 1 Kandangan Kediri. The reasoning multiple choice (two-tier) using instrumental test of mastery concept was used with reliability value of 0.649. The result of the analysis presented that the mean value of student’s concept mastery in Newton's law was of 24.3 with a maximum value of 100 presenting a low category. The low score of student’s understanding exhibited that students had difficulties in Newton’s law concept. In general, many students had difficulties in identifying and interpreting the formula , identifying the forces with free body diagram, and understanding action, and reaction forces.

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