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All Journal Tadris: Jurnal keguruan dan Ilmu Tarbiyah Journal of Natural Sciences and Mathematics Research
Niken Tri Widayati
Universitas Negeri Semarang
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Education Materials Science & Nanotechnology Physics

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Measurement of Moment of Inertia Through a Bifilar Pendulum Swing Based on a Microcontroller Niken Tri Widayati; Nadia Wahyu Lurinda; Hartono Hartono; Supriyadi Supriyadi
Journal of Natural Sciences and Mathematics Research Vol 5, No 2 (2019): December
Publisher : Faculty of Science and Technology, Universitas Islam Negeri Walisongo Semarang

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (473.257 KB) | DOI: 10.21580/jnsmr.2019.5.2.11028

Abstract

Every object has a tendency to maintain its state of motion. The concept also applies to rotating objects called moments of inertia. This experiment aims to explain the working principle and determine the magnitude of the moment of inertia of objects using a bifilar pendulum teaching aid based on the ATMEGA-16 microcontroller. The implementation method used is the experimental method. The working principle of the ATMEGA-16 bifilar pendulum microcontroller-based teaching aids uses the bifilar pendulum principle. The moment of inertia of an object can be measured using a measuring tool that works at the moment of the inertia oscillation method. The bifilar pendulum experiment consists of an object which is tied on either side by a rope and then attached to a support. Objects are deviated horizontally with a small angle to the equilibrium position and then released, the object will experience periodic oscillations. Based on the experimental results the shorter the distance of the two bifilars, the period will be even greater, and vice versa. The magnitude of the period (T) on the bifilar pendulum is inversely proportional to the root distance between the two bifilar (d). The results of experiments carried out for variations in rope length and the distance between the ropes. The moment of inertia based on experiments for variations in length of rope at 0.35 m is (I ± ΔI) =   kg/m2 ; 0.45 m is (I ± ΔI) =   kg/m2 ; 0.55 m then (I ± ΔI) =   kg/m2 ; 0.65 m then (I ± ΔI) =   kg/m2 and 0.75 m, (I ± ΔI) =   kg/m2.. Furthermore, the moment of inertia is based on experiments for variations in the distance between the ropes at 0.1 m then (I ± ∆I) =  kg/m2; 0.15 m then (I ± ∆ I) =  kg/m2; 0.20 m then (I ± ∆I) =  kg/m2; and 0.25 m then (I ± ∆I) =  kg/m2. The experimental results show that the smaller the distance between the two ropes will produce conformity to the theory of the solid cylinder using the shaft approach through the center.©2019 JNSMR UIN Walisongo. All rights reserved.
Development of a Four-Tier Test with a Metacognitive Perspective Approach on the Topic of Newton's Laws Bambang Subali; Niken Tri Widayati; Felia Oktaviana Sekarningtias; Wiyanto Wiyanto; Ellianawati Ellianawati; Siswanto Siswanto
Tadris: Jurnal Keguruan dan Ilmu Tarbiyah Vol 7, No 1 (2022): Tadris: Jurnal Keguruan dan Ilmu Tarbiyah
Publisher : Universitas Islam Negeri Raden Intan Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (454.313 KB) | DOI: 10.24042/tadris.v7i1.9615

Abstract

This research aimed to develop a learning evaluation instrument on Newton's Law Materials using a four-tier test with a metacognitive perspective to identify students' thinking abilities from metacognition and students' misconceptions. The research employed the RD (Research and Development) design with a 4-D development model (define, design, develop, and disseminate). The instrument was constructed by developing twelve questions. There were ten valid and reliable questions with good quality parameters (difficulty level and differentiating power). The researchers analyzed the four-tier test instrument with a metacognitive perspective approach using item difficulty level analysis, item discriminatory analysis, test reliability analysis, and expert validity testing. This research involved 30 participants in the small-scale test and 250 participants in the large-scale trial. The test results showed that the ten questions could identify students' thinking abilities from the perspective of metacognition and misconceptions on Newton's Law material. The findings of the large-scale test showed that students' thinking skills were mapped into high, medium, and low categories. Students' misconceptions were also mapped on each indicator of the questions compiled. Based on the mapping result, the highest students' misconceptions were found in the aspect of the metacognitive experience, with an average of 76 percent of students experiencing misconceptions.
Co-Authors Bambang Subali Ellianawati, Ellianawati Felia Oktaviana Sekarningtias Hartono Hartono Nadia Wahyu Lurinda Siswanto Siswanto Supriyadi Supriyadi Wiyanto Wiyanto