This study aims to produce teaching materials in the form of CTL-based worksheets for class XI at Senior High School. The method used in this research is the method of development. The initial stage is an analysis of the teaching materials used by teachers at school. Before being tested on class XI students, the worksheets were validated by experts as well as physics teachers and students at Senior High School 1 Gunung Tuleh. After being validated, improvements were made according to the suggestions given. The average results of the validation of learning experts, physicists, and linguists were 0.77, 0.90, and 0.81 from all aspects. The practical value of teachers and students is 79.68 and 87.43 with the valid category. After testing the validity and practicality of the physics learning videos, the results of the effectiveness test of the learning videos were obtained to measure students' critical and creative thinking skills. The average N-gain values are 0.22 and 0.26. With the overall results obtained, it can be concluded that the contextual-based worksheets that have been developed are suitable for use in learning activities

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Numerous studies have been conducted on an inversion method, focus on constraining factor,singuler value, speed of convergence. However, the result of inversion is not unique and bivalent. In this research, we optimize of Least-Square constrain by using damping factor. Th is method used for interpretation of the volumes and rock structure in Malalak Distric of Agam West Sumatra. This is undertaken because Malalak districts of Agam West Sumatra that passed by highway Padang and Bukittingi is a frequent area of landslide. Furthermore, the frequency of the landslide depends on the type of rock and the angle of the slope . The depth of the slide surface can be predicted by using the least squares inversion constrain method of Geoelectric Resistivity. Landslides resulted in disruption of transportation between the city of Padang and another district in Sumatra. Based on the above, to determine the rock's structure, the depth and tilt angle of the slide surface in Malalak districts Agam West Sumatra has to take place. Data obtained through Geoelectrical exploration using with automatic resistivitymeter equipment. Constrains were obtained using the Marquat inversion method. The result of the research is first, the damping factor for structures which have wide range resistivity is 0.02 and the smallest damping factor is 0.015. Second, the rock structure in Malalak of Agam consists of clay, sandstone, andesite, and limestone and dolomite. Implementation this research can be used to develop mitigation of landslide deserter.

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Sumatera Barat memiliki topografi bergelombang dan curam. Sumatera Barat disamping memiliki kemiringan topografi lebih dari 30 derajat, juga memiliki curah hujan yang tinggi. Kondisi tersebut menjadikan kawasan ini memiliki potensi resiko longsor yang cukup tinggi. Masalah ini perlu ditanggulangi dengan melakukan penelitian tentang bagaimana karakteristik permukaan bidang gelincir sebagai studi pendahuluan mitigasi longsor di Sumatera Barat. Informasi tentang karakteristik bidang lincir di daerah rawan longsor di Sumatera Barat belum banyak tersedia. Dengan alasan di atas, dilakukan penelitian yang bertujuan untuk mengetahui kedalaman dan kemiringan bidang gelincir di Kota Padang dan Kabupaten Agam Sumatera Barat. Penelitian eksploratif ini menggunakan metode resistivitas dengan peralatan Ares (produksi Cheko). Data resistivitas semu diinterpretasikan menggunakan metode inversi Least-Square yang telah dioptimalkan untuk mendapatkan penampang 2D resistivitas sesungguhnya. Ketebalan dan kemiringan permukaan bidang gelincir daerah target dihitung berdasarkan penampang 2D resistivitas sesungguhnya dengan bantuan data topografi. Penelitian menunjukkan bahwa rata-rata kedalaman dan sudut permukaan bidang gelincir di Kabupaten Agam Sumatera Barat masing-masing adalah 410 dan 16,5 meter. Rata-rata kedalaman dan sudut kemiringan permukaan bidang lincir di Padang masing-masing 380 dan 12,5 meter. Batuan yang berperan sebagai permukaan bidang gelincir adalah Clay.   West Sumatra has wavy and steep topography. Beside, West Sumatra has topographic slope more than 30, it also has high rainfall. This condition makes this area has a high potential of landslide risk. This problem needs to get a scientific study of how the surface characteristics of the landslide field as a preliminary study of landslide mitigation in West Sumatera. Information on the characteristics of landslide surfaces in landslide prone areas in West Sumatra has not been widely available. Based on the above reason, research has been done to find out the depth and slope of the landslide surface in Padang and Agam Regency of West Sumatra. This explorative research uses resistivity method using Ares equipment set (Cheko production). The apparent resistivity data is interpreted using the optimized optimized least-squares smoothness-constrain inversion method in order to obtain true resistivity 2D cross-section.  The layer thickness and the slope of landslide surface the targeted area was calculated base on true resistivity 2D cross-section that synchronized with topographic data. The results showed that the average both depth and angle of the landslide surfaces in Agam regency of West Sumatra were 41 degree and 16.5 meters respectively. The average both depth and angle of the landslide surfaces in Padang were 38 degree  and 12.5 meters respectively. The rock that acts as a landslide surfaces is Clay.

In facing the era of the industrial revolution 4.0, education is needed that can form a creative, innovative, and competitive generation. This can be achieved by optimizing the use of technology as a tool in education. In terms of education, the government made improvements to the learning system, namely curriculum development. The 2013 curriculum regulates learning resources, namely books, print and electronic media. But in reality the student books used in school only contain physics material and have not been fully integrated with the dimensions of attitude, spirituality, and local context. The existing teaching materials have not included the implementation of the 2013 curriculum and are not sufficient for students to learn independently. One solution to this problem is the physics e-book based on Edupark. This study aims to produce a physics e-book based on the Edupark Hot Waterboom in South Solok using a professional flip pdf for valid high school / MA students. The type of research used is development research using the Plomp development model. The plomp model is a research design suitable for developing research-based solutions in education. The plomp model is used to develop or validate theories about the learning process. The results of the validation test are used to test the advantages of the product that has been made and as a guide in making revisions to the e-book. The average value of each assessment component in the physics e-book based on the South Solok Water Boom Edupark can be determined from the average of the four assessment components including 1) content feasibility component 2) learning design component 3) display component and 4) software utilization component. From the percentage of the four components, the results of the e-book validation instrument were obtained by three validator experts with an average percentage of 85.11% with a very valid category

Penelitian ini bertujuan untuk mengembangkan sebuah media pembelajaran PJOK berbasis kartu gerak aktivitas pengembangan untuk siswa kelas X SMA/SMK. Jenis penelitian ini adalah penelitian pengembangan, menggunakan model pengembangan ADDIE yang terdiri dari 5 (lima) tahapan yaitu: tahap analisis (analysis), desain (design), pengembangan (development), implementasi (implementation), evaluasi (evaluation). Penelitian ini dilaksanakan pada 2 (dua) SMA/SMK di Singaraja yaitu SMA Negeri 1 Sukasada dan SMK Negeri 1 Sukasada tahun pelajaran 2018/2019. Penelitian ini melibatkan partisipasi aktif guru PJOK dan siswa pada kelima tahapan pengembangan. Pengumpulan data diperoleh melalui 1) angket analisis kebutuhan, 2) lembar validasi pakar dan praktisi PJOK, 3) angket pendapat guru tentang media pembelajaran dan, 4) angket pendapat siswa tentang media pembelajaran. Hasil penelitian pengembangan ini menunjukan 1) media pembelajaran kartu gerak aktivitas pengembangan sangat dibutuhkan oleh guru dan siswa, 2) tugas gerak pada kartu gerak aktivitas pengembangan telah memenuhi konsep dan teori pembelajaran PJOK, 3) pendapat siswa tentang kartu gerak aktivitas pengembangan diperoleh persentase 99,64% dengan kategori sangat baik. Berdasarkan hasil penelitian dan pembahasan disimpulkan bahwa media pembelajaran kartu gerak aktivitas pengembangan layak digunakan untuk siswa kelas X SMA/SMK.