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A Study on the Harmonic Oscillation of a Physical Pendulum by Using the Internet of Things
New Phys.: Sae Mulli 2018; 68: 1151~1156
Published online October 31, 2018;
© 2018 New Physics: Sae Mulli.

Se-Hun KIM*

Faculty of Science Education and Research Institute of Education Science, Jeju National University, Jeju 63243, Korea
Correspondence to:
Received September 11, 2018; Accepted October 4, 2018.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
We studied scientific experiments by using the Internet of things in the 4th industrial revolution. The experiments on simple harmonic motion were performed with a physical pendulum composed of a metallic ruler and a smartphone. The periodic motion of the physical pendulum was analyzed by using the distance between the axis of rotation and the center of mass of the rigid body. A software app of a smartphone can convert an analog signal to 3D digital acceleration data. The transmitted acceleration data can then be fitted by using a regression analysis. In particular, the phase space and the quality factor of a physical pendulum combined with a smartphone were calculated. 
PACS numbers: 07.07.Df, 04.80.-y, 06.30.Gv, 07.05.Hd, 07.05.Tp
Keywords: 4th industrial revolution, Physical pendulum, Internet of things, Harmonic oscillation, Nonlinear regression analysis

January 2019, 69 (1)
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