<![CDATA[Conceptual understanding is one indicator of success in learning. Mastery of concepts is seen when someone can solve a problem. This study aims to see student's mistakes in identifying and describing diagrams of force, particle dynamics. This type of research uses quantitative descriptive research with survey methods, research subjects amounted to 97 students. The technique of collecting data in the form of reasoned multiple choice tests with alpha cronbach is 0,68. The results of the study show that almost all students experience errors in identifying and describing the style diagrams that work on a system. Common mistakes that cause students to fail to work on problems well are because students are more likely to memorize mathematical formulations of a concept, without knowing how the concept is formed.]]>
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