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Abstract: This study aims to determine the mastery of the concept of three-dimensional rigid body motion (GBT3D) in learning analytical mechanics in physics education students. The subjects of this study were the third semester students totaling 21 people in one LPTK. The instrument of data collection in this study was a test of learning outcomes mastery of the concept of rigid objects in three dimensions (GBT3D) based on multiple representations (MR) in accordance with indicators of understanding concepts using Revised Blooms Taxonomy and knowing the effect of critical thinking skills using the California Critical Thinking Test ( CCTT) and Critical Thinking Disposition Inventory (CTDI) to evaluate students critical thinking. The results of this study obtained a mean value of 37.38 pretest and posttest average value of 57.43 with an N-Gain percentage of 31.80% for mastering the GBT3D concept showed an increase. The results of multiple representation (MR) analysis on GBT3D material MFIs were 35.71% verbal, 28.38% images, 25.71% graphs and 32.95% mathematics showed sufficient percentages. The results of the Critical Thinking Skills (CBC) analysis on (GBT3D) fall into the less category.