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Abstrak   Penelitian bertujuan untuk menguji pengaruh model pembelajaran  problem  -based learning  terhadap pemahaman konsep dan pemecahan masalah materi hukum Archimedes di kelas XI IPA SMA Negeri 1 Ketungau Tengah. Penelitian menggunakan  quasi  -experimental designs  dengan  nonequivalent groups posttest only . Instrumen yang digunakan adalah butir soal pemahaman konsep berbentuk tes pilihan ganda dan pemecahan masalah berbentuk tes uraian. Populasi penelitian seluruh siswa kelas XI IPA SMA Negeri 1 Ketungau Tengah tahun pelajaran 2018/2019. Sampel sebanyak 37 orang siswa yang terdiri dari dua kelas yang diambil dengan teknik  cl  uster random sampling . Analisis data menggunakan uji MANOVA dua arah. Hasil penelitian: (1) Kemampuan pemahaman konsep siswa cukup dan pemecahan masalah siswa baik setelah diterapkannya model pembelajaran  problem  -based learning ; (2) Kemampuan pemahaman konsep siswa kurang dan pemecahan masalah siswa sangat kurang setelah diterapkannya model pembelajaran konvesional; dan (3) Terdapat pengaruh model pembelajaran  problem  -based learning  terhadap pemahaman konsep dan pemecahan masalah materi hukum archimedes.AbstractThe research aims to examine the effect of the problem-based learning model of learning on concept understanding and problem-solving of Archimedes material in class XI IPA of SMA Negeri 1 Ketungau Tengah. The research used quasi-experimental designs with nonequivalent groups posttest only. The instrument used was a matter of understanding the concept in the form of multiple-choice tests and problem-solving in the form of description tests. The population of the research was all students of class XI IPA of SMA Negeri 1 Ketungau Tengah in the academic year 2018/2019. A sample of 37 students consisted of two classes taken cluster random sampling technique. Data analysis using the MANOVA two-way test. The results of the research: (1) The ability to understand students' concepts is sufficient and students' problem-solving is good after the application of the problem-based learning model; (2) The ability to understand students' concepts is lacking and students' problem-solving is very lacking after the application of conventional learning models; and (3) There is an influence of the problem-based learning model on the understanding of concepts and problem-solving in Archimedes material.

PENGARUH PROBLEM-BASED LEARNING TERHADAP PEMAHAMAN KONSEP DAN PEMECAHAN MASALAH DALAM MATERI HUKUM ARCHIMEDES