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We have developed 21st century skill instruments in form of Android application that contain experiment activity video contained data. 16 multiple choice questions were made in equal numbers on straight-motion topics to gauge students' 21st-century skills based on Esther core et. al. The developed instruments for linear motion topic both for constant velocity and acceleration motion for junior high school students. The instrument has been reviewed by three science education experts. The developed instruments are tested to 44 students in one junior high school in Bandung. We found that in constant velocity motion topic the average 21's century skill is 34% with highest achievement in the collaboration skill (51%) and lowest in creative skill (29%). And in constant acceleration motion the average 21's century skill is 11% with highest achievement in the collaboration skill (44%) and lowest in communication skill (20%). Based on this result we suggest all effort in learning process to enhance 21st century skills for junior high school students [ABSTRACT FROM AUTHOR]

A pre-existing landslide mass may be unstable and pose a hazard to critical infrastructures during heavy rainfall. Proper understanding of such a risk is predicated on an accurate hazard characterization. This paper is aimed to present the application of slope stability analysis and the center of mass approaches to estimate run-out distance and velocity of the unstable pre-existing landslide mass in Cibitung, Bandung Regency. The slope stability analysis was carried out using the Pybimstab and Slope/W software. The results of the slope stability analysis using both software resulted in a nearly similar location of the sliding plane within the Cibitung landslide mass. Based on calculations using the center of mass approach, the Cibitung landslide may be classified as an extremely rapid movement with a velocity of up to 7.7 m/s and a run-out distance of up to 38 m. Thus, the landslide risk is still prominent in the study area. [ABSTRACT FROM AUTHOR]

The purpose of this study was to investigate the semantic network keywords of students in the Levels of Inquiry (LoI) learning to the stage real-world application (experimental class) compared with LoI until the stage inquiry labs (control class). The research method used is quasi-experimental with pretest-posttest control group design. The research subjects used 72 students consist of 46 males and 26 females with their average age 15 years old of class X at one of the high schools in Duri City with convenience sampling technique. The instrument used to determine the students' semantic network was a pretest and posttest in the form of an open-ended essay question task about the concepts of momentum and impulse. The data were analyzed using a software-assisted semantic network analysis called Netminer version 4.x64. After learning, overall the results showed that the implementation of Levels of Inquiry could improve students' mastery of concepts in the material of momentum and impulse. The results of the analysis of pretest the semantic network of students in the control class found 3 keywords with a small frequency to represent the concept of momentum and impulse, and in the posttest it was found that it increased to 10 keywords with a greater frequency of occurrence while the results of the analysis pretest of the students' semantic network in the experimental class found 3 keywords with a small frequency to represent the concept of momentum and impulse, and in the posttest found to increase to 11 keywords with a greater frequency of occurrence. [ABSTRACT FROM AUTHOR]

The occurrence of rapid slope movements is common in man-made slopes during heavy rainfall in West Java Province, Indonesia, and may pose a risk to transportation infrastructures such as railways and highways. Mitigation of such a landslide risk requires an understanding of the characterization of the hazard. The study presented in this paper aims to characterize a slope failure hazard at a railway section located between Sukatani and Ciganea stations in Purwakarta Regency. The objectives of this study were to determine the sliding surface within the man-made slope using Slope/W and PyBIMstab software and to predict the run-out distance and the velocity of the slope movement using the center of mass approach. Both slope stability software shows a good agreement in determining the slip surface location within the slope at critical safety factors. Based on the center of mass approach, the slope failure is characterized by a run-out distance of about 24.5 m and a movement of more than 6.3 m/s. Therefore, the combination of long run-out and extremely rapid movement indicators would suggest a high risk to the railway traffic. [ABSTRACT FROM AUTHOR]

A landslide occurrence may involve a rapid movement and poses a substantial risk to a densely populated area. Thus, an effort to reduce the substantial landslide risk requires understanding landslide velocity and run-out distance. The study presented in this paper attempts to estimate the run-out distance and velocity of a potential landslide movement in the Sidamukti area, Bandung Regency, using two different slope stability analysis software and the center of mass approaches. The slope stability analysis results show that the estimated potential landslide masses obtained from PyBimstab software show a good agreement with those obtained by Geostudio software. Accordingly, the results of the center of mass analysis of both estimated landslide masses resulted in a run-out distance of approximately 60 m and a velocity of more than five m/s. Thus, the landslide in the study area can be classified as an extremely rapid landslide. [ABSTRACT FROM AUTHOR]

Rainfall-induced landslides are a very common occurrence in hilly regions in West Java Province. Efforts to mitigate the landslide hazard require knowledge about the landslide hazard characteristics. This paper presents the results of an analytical study aimed to determine the sliding surface and to estimate the run-out distance and velocity of the Pasirjambu landslide, Bandung Regency. For these objectives, slope stability analyses were conducted using pyBIMstab and SLOPE/W software, and the run-out distance and velocity were predicted using the center of the mass approach. The results of slope stability analysis show that a good agreement of sliding surface location for a critical safety factor was obtained using both slope stability software. The predicted run-out distance and velocity indicate that the Pasirjambu landslide is likely to exhibit a long run-out of 87 m and move at a velocity of about 8.3 m/s. Thus, the Pasirjambu landslide hazard would pose a significant risk to the residents below the landslide zone. [ABSTRACT FROM AUTHOR]

The study was conducted to get an overview of online lab-based virtual tests to measure students' 21st-century skills on measurement materials. The research method used in this study is to use R&D using addie design. The 16 multiple choice items measuring 21st Century Skills based on real laboratories for time and measurement physics topics were developed by capturing 21st century skill frameworks based on expert validity analysis, developing blueprint tests based on physical materials in school curricula, analyzing 21st Century Skills assessment items based on collected data. The construction of the framework is carried out through a literature review (several 21st Century Skills Frameworks, the study of physical materials in the Indonesian curriculum 2013, and analyzing contextual issues as project issues that can be developed). First, based on a real laboratory, we built 16 open-ended questions to measure time measurements and 4C physics to 10th graders in West Java to capture their answers to multiple answer options. Then the instrument is validated by the expert and revises the item if it does not need to be revised. The next step is to validate the contents using an assessment sheet that has been created to be given to the validator. This instrument has been validated by experts. This validation sheet to state the suitability of problem items with 21st century skills indicators. The material provided contains 2 subjects (time and physics measurement) for the first test has a low validity of 0.58, high reliability of 0.73, and good disk interest power. the second test has a low validity of 0.72, high reliability of 0.83, and good discrimanting power. There is a balance or proportion of the difficulty level of the question (easy, moderate, and difficult). [ABSTRACT FROM AUTHOR]

The purpose of this research is to develop standardized test instruments to measure 21st century skills (4Cs) based on real laboratory for Indonesian eleventh grade high school students on the subject of temperature and heat transfer. The method used in this study is research and development (R&D) by adapting the ADDIE development model. The instruments used to consist of 16 items multiple choices measuring 21st century skills based on real laboratory both for temperature and heat transfer topic. The same instrument was tested on 3 experts and 63 eleventh grade students who attended school on the island of Java, consisting of 37 female students and 26 male students. The revised results will be processed to become stage 2 test instruments. We analyzed the feasibility of 21st century skills test instruments using an ANATES V4. We analyze its validity using the Content Validity Ratio (CVR) and Content Validity Index (CVI). We found that the test of sub-material temperature and expansion has high reliability 0.60 and for the test of sub-material conduction heat transfer has enough reliability 0.49. There are some problems not validated are caused by several factors, such as students simply guessing the answers, not watching experimental videos first, not studying heat matter, etc. The implication of this study is that the problems with this proposed standardized test should be further improved. [ABSTRACT FROM AUTHOR]

A toll bridge was constructed in an old landslide zone in the Cikareteg area in Bogor, West Java. Knowledge of the slip surface is necessary to mitigate the hazard associated with the possible reactivation of the landslide. This paper presents the results of the resistivity tomography survey conducted in the vicinity of the toll bridge using dipole-dipole configuration to estimate the depth and geometry of the slip surface of the old landslide. Results of the resistivity tomography indicate that the non-circular sliding zones are located within a thick soil layer of low resistivity values at a depth of less than 10 m below the slope surface. The resistivity images also suggest that the groundwater table exists at shallow depth in the landslide masses. Thus, the thick landslide materials and shallow groundwater table in the vicinity of the bridge pose an imminent landslide hazard to the toll road. [ABSTRACT FROM AUTHOR]

This study aimed to design a media for physics learning based on Android apps. The learning media are designed based on conceptual discussion, simulation, and video with mini-quizzes containing cognitive, affective, and psychomotor aspects. Android apps have been tested to be valid, practical, and effective for use in the classroom. The adopted model development is the ADDIE model which stand for Analysis, Design, Development, Implementation and Evaluation. The media were tested by physics education expert and experimented on a small group tests. Data were collected through questionnaires analyzed through descriptive statistics, interviews, and observations, and analyzed through qualitative analysis. The physics learning media was produced named Phy-Cast (Physics-Cast). The Android apps contain several senior high school physics topics namely discussing parabolic motion, fluid statics, and quantum phenomena. As a result of the study, it was found that Phy-Cast, physics learning media, has good compatibility, and there is no major problem when used. Phy-Cast has been tested in a small group, and the results have shown that the learning tool is valid, practical, and effective for use in the learning process. [ABSTRACT FROM AUTHOR]

This study aims to find out the ability to master the concept of high school students in grade X on newton's law subject. Mastery of concepts is a very important component in the study of physics. The research method used is descriptive quantitative. The study subjects consisted of 36 students consisting of 24 women and 12 men with an average age of 15-16 years at one of the high schools in Duri city. The research instrument consists of 25 items of multiple-choice questions. The cognitive dimension of multiple-choice questions consists of C1-C6 levels based on bloom's revised taxonomy. The data analyzer uses a Rasch model based on logit values obtained by Winstep software-assisted students. The results obtained an average value of 0.57 and a standard deviation of 1.33. From this score were found 3 quality groups of mastery of student concepts, namely; quality groups of students with high, medium and, low categories. Overall, the percentage of students' concept mastery skills is in a low category. The results of this study contribute information and description to teachers about the condition of students' concept mastery ability. Teachers can make various efforts and innovations in learning to improve the mastery of student concepts. [ABSTRACT FROM AUTHOR]

Teaching and learning during pandemic which unable the student to provide face to face class. Therefore, we need to provide the material for online teaching and learn to be more engaged. The purpose of the study was to investigate students' Motivation toward Science Learning (SMTSL) using Inquiry-based Learning supported by Instagram in light and optic topic. The method of this study is using a pre-experimental design one-shot case study. The instrument of collecting data using the Students' Motivation Towards Science Learning (SMTSL) questionnaire. The questionnaire consists of 35 questions with 9 questions in a negative statement. The questionnaire is divided into six aspects. There are self-efficacy, active learning strategy, science learning value, performance goal, achievement goal, and learning environment simulation. The samples of this study consist of 17 students of 8th-grade students from one of the Junior High Schools in Bandung, Kuala Lumpur, and Yogyakarta. The result of the study shows that the students' have a good motivation, with an average score of 75.71%. The highest n-gain in science learning value domain with 82.82% which described as very good motivation. The lowest n-gain result is in self-efficacy and performance goal domain with 70.29% which described as good motivation. Implementing inquiry-based learning supported by Instagram can gain the students' motivation in learning science. [ABSTRACT FROM AUTHOR]

Scientific process skills (SPS) are important as the basis for developing the skills of the 21st century that are required to face the industrial era 4.0 and society 5.0. However, the Covid-19 pandemic allows learning to take place online so that it has an impact on the scientific process skills of students. The purpose of this study was to analyze the scientific process skills of 10th grade students at a public high school in Kabupaten Bekasi. Measured aspects of the scientific process skills include observing, interpreting, predicting, planning experiments, communicating and applying concepts. A descriptive quantitative is used as this type of research. The research sample consisted of 211 grade 10th students (133 females and 68 males) who had completed learning the concept of simple harmonic oscillation online. The data was collected through tests and interviews. The percentage of the scientific process skill test on the aspect of observing, interpreting, predicting, planning experiment, communicating and applying concepts were 48% (less), 56% (less), 58% (less), 46% (less), 46% (less) and 45% (less), respectively. Therefore, it is necessary to make efforts in online learning to improve scientific process skills of students. [ABSTRACT FROM AUTHOR]