Critical Thinking Skills are one of the skills that can be created in science learning, including physics lessons. The reason for this study is to measure students' critical thinking skills in a physics lesson, namely impulse and momentum. The subjects of this study were students of K-10 Students of Minang Tribe in Padang City aged 15 to 16 years. Students consist of 14 male students called "bujang" and 16 female students called "gadih". This research is a single case study with embedded

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... The instrument was a critical thinking skill test that has been validated by the expert. The instrument used was 5 essay test questions with five different aspects of critical thinking skills, including elementary clarification, basic support, inference, advance clarification, and strategy and tactics. Each aspect consists of several different indicators which are then developed into five essay questions represented by one question for each aspect. Indicators and aspects of critical thinking skills. The question instrument used has been validated with the validation results in the high and very high categories. The results of the test pointed out that good understanding is 6.66%, no understanding is 56% and misconception is 37.34%. The inference is the need for the realization of learning that train students' critical thinking skills such as the development of instruments.