Abstract. Science process skills are a set of skills used in scientific activities. Students with science process skills are actively involved in learning. Opportunities to be actively involved in learning can be obtained by students if the learning stage is designed in such a way. This article is about a lesson that is expected to teach students' science process skills and can help build their understanding of the concept of buoyant force. This learning can be carried out for students at the junior high school level. This learning process uses the 5-stage learning cycle consisting of observation, manipulation, generalization, verification, and application phase. Each activity is expected to facilitates students to develop science process skills such as observing, inferring, predicting, asking questions, constructing hypotheses , designing experiments, applying concepts, and communicating.

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This study aims to investigate the effect of differentiated learning in the Problem Based Learning model on the cognitive learning outcomes of high school students. This research uses a quasi-experimental approach with a Nonequivalent Control Group research design. The research sample was selected using a purposive sampling technique with a total sample of 70 students of class X in one of senior high schools in Cimahi city, Bandung. The instrument used consisted of 4 reasoned multiple choice questions about momentum and impulses to measure students' cognitive learning outcomes. The results showed that the average value of N-Gain in the experimental class was 0.81 in the high category and in the control, class was 0.42 in the medium category. Statistical results show that the value of Asymp.Sig is 0.00 > 0.05. That is, there is an effect of differentiated learning in the Problem Based Learning (PBL) model on the cognitive learning outcomes of high school students on physics material

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ABSTRAKTelah dilakukan penelitian eksperimental tentang model pembelajaran Two Stay Two Stray di salah satu SMA di Kota Bandung. Penelitian ini bertujuan untuk menganalisis tingkat pemahaman konsep siswa pada materi momentum dan impuls dengan menggunakan model pembelajaran two stay two stray (TSTS). Pemahaman konsep siswa diukur dengan tes diagnosis berupa tes pilihan ganda dengan menggunakan skala Certainty of Response Index (CRI). Metode penelitian adalah Quasi Experimental dengan desain One Group Pretest Posttest yang melibatkan 37 orang siswa. Hasil penelitian menunjukan bahwa pemahaman konsep siswa SMA pada materi momentum dan impuls setelah pembelajaran meningkat, yaitu 16,8% pada pretest menjadi 70,6% pada posttest. Keefektivitasan pembelajaran dengan menggunakan model TSTS ini dapat dilihat dari nilai N-gain sebesar 0,64. Kata kunci: CRI, konsep momentum dan impuls, two stay two stray (TSTS) ABSTRACTExperimental research about Two Stay Two Stray (TSTS) learning model has been conducted in one of senior high school in Bandung. This research aimed to analyze students' understanding of momentum and impulse concepts by using TSTS learning model. Students' conception were identified by multiple choice-diagnostics test using Certainty of Response Index (CRI) scale. Research method was pre-experimental design with one group pretest posttest design involving 37 students as research subjects. Results showed that profile of students' understanding of momentum and impulse concepts were increased from 16,8% in pretest to 70,6% in posttest. Effectiveness of TSTS learning model was reflected by N-gain of 0.64.