This study aims to determine the effectiveness, feasibility, and influence of the Ethno-STEM Independent Learning Activity Unit (UKBM) in improving students’ critical thinking skills. This type of research is R&D with the ADDIE type. The research sample used a purposive sampling technique in small-scale and large-scale trials at one of the private junior high schools in Salatiga City. The results of the study show that 1) e-UKBM Ethno-STEM has the characteristics of implementing an ethnoscience aspect that links scientific knowledge with local wisdom, studying science through local wisdom in a balanced way, guided by the Merdeka Curriculum and the 2013 Curriculum by using a scientific approach; 2) Ethno-STEM e-UKBM is suitable for use in science learning on substance stress; 3) e-UKBM Ethno-STEM can improve critical thinking skills with an N-Gain value of 72.27% in the high category; 4) e-UKBM Ethno-STEM has an effect on critical thinking skills with a t-count of 10.87. Based on the results of this study, it can be concluded that e-UKBM Ethno-STEM is appropriate to be used to improve student’s critical thinking skills in substance stress study materials.

Research has been conducted to find out relation position and speed to time, for objects that glide on a magnetic foundation by applying the Research and Development method. Data retrieval is done by using video train motion recordings which are analyzed using Logger Pro. The results of the analysis are represented in the form of data and graphics. Based on the data analysis and fitting using the Logger Pro, the following values are obtained: v train 0.027 m/s, a train 0.034 m/s 2 , average train velocity 0.02572 m/s and average train acceleration 0.03662 m/s 2 with RMSE (Root Mean Square Error) value of 0.013 m. The acceleration value obtained is very small and almost close to zero, so it can be said that objects that experience irregular straight motion. The graph representation of velocity over time shows an increase in speed that is not constant. This is because there is still friction between the train and the runway and friction between magnets along the track with friction forces 4,566 N. The value of kinetic energy, potential energy, and mechanical energy can be determined by using the results of Logger Pro analysis.

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