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All Journal JURNAL ILMIAH PENDIDIKAN FISIKA AL BIRUNI Indonesian Review of Physics (IRiP)
Jaafar, Rosly
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Astronomy Earth & Planetary Sciences Education Electrical & Electronics Engineering Materials Science & Nanotechnology Physics

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Effect of the Magnetic Force on Ferrite Pendulum Oscillation Parameters: Parametric Analysis on Ferrite Pendulum Adi, Rusli; Toifur, Moh; Ishafit, Ishafit; Jaafar, Rosly
Indonesian Review of Physics (IRiP) Vol 3, No 1 (2020)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/irip.v3i1.1836

Abstract

The magnitude of the damping force of the mathematical pendulum swinging on a medium is usually proportional to the speed of the pendulum. In this research, the pendulum oscillation parameters oscillating on an air medium under the influence of a magnetic field of 1.8 G will be investigated. In the initial stage, the effect of the magnetic force on the damping coefficient of ferrite pendulum oscillations with an initial deviation of 15 degrees observed. Furthermore, the study continued with varying the angle of deviation from 5 degrees to 25 degrees. The results of the data fitting amplitude (xi) at various swing times (ti) are using to analyze the effect of the angle of deviation on the maximum amplitude. The results showed that for the deviation angle of 15o the coefficient of damping of the medium affected by the magnetic force was 0,0022 greater than the coefficient of air damping 0,00006. It affects the amplitude, which decreases faster than the pendulum amplitude without the influence of magnetic force. Variation in the angle of deviation also affects the amplitude of the pendulum. In the deviation angle below 10, the pendulum motion is more influenced by the magnetic force, whereas in the deviation above 10, the pendulum motion is more dominated by gravity.
Critical thinking in physics: Momentum critical thinking test for pre-service teacher Negoro, Ridho Adi; Rusilowati, Ani; Aji, Mahardika Prasetya; Jaafar, Rosly
Jurnal Ilmiah Pendidikan Fisika Al-Biruni Vol 9 No 1 (2020): Jurnal Ilmiah Pendidikan Fisika Al-Biruni
Publisher : Universitas Islam Negeri Raden Intan Lampung, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24042/jipfalbiruni.v9i1.4834

Abstract

The debate in the making of critical thinking evaluation tests among researchers and practitioners still exists. Problems come from definition and aspects segmentation which represents critical skills to be measured. According to the problems, the specific critical thinking instruments to physics content such as momentum are still hard to find. The instrument of critical thinking can support the learning evaluation to improve the critical power of Pre-Service. This study aims to develop the instrument of momentum critical thinking (MCT) test for Pre-service teachers. The MCT consisted of 8 questions representing 17 objective items. Based on the content validity test, it obtained a total percentage of 81.25% with the eligibility criteria. The reliability test demonstrated by the result of 28 pre-service teacher tests. The MCT instrument which tested was 17 objective items. The reliability test’s results showed Cronbach's alpha value of 0.716 with a high category. Research findings show that the CTM test can be used to measure the CT-specific domain of pre-service teachers in momentum, and relevant material for the consideration of university preparation for pre-service teacher learning in the 21st century
Co-Authors Adi, Rusli Ani Rusilowati Ishafit Ishafit Mahardika Prasetya Aji Moh. Toifur Ridho Adi Negoro