OPAC - Artikel Jurnal & Majalah

Pengarang	:	-
Nama Majalah/Jurnal	:	The Physics Teacher
Volume / Edisi	:	62 (No. 3)
Halaman	:	196-198
Abstrak	:	Harmonic motion, undamped or damped, is one of the representative topics in introductory-level physics.1 However, because it is one of the most interesting applications of Newton’s laws of motion, as well as of differential equations, the same subject matter is also discussed in relatively advanced texts in classical mechanics.2–4 In the teaching of it, experimental demonstrations of the associated theory play an important and beneficial role. This explains the substantial body of works that have already entered the literature. These related literature entries differ from each other primarily in the aspect of the data analyses and data acquisitions used. As a result, they have varying degrees of accessibility and convenience. For one, using a smart cart and a smartphone, some authors have demonstrated damped harmonic motion.5 For another, Tracker, a well-established physics modeling tool, has also been used to study the system.

Pengarang	:	-
Nama Majalah/Jurnal	:	The Physics Teacher
Volume / Edisi	:	62 (No. 3)
Halaman	:	194-195
Abstrak	:	Adding two motions together can give an interesting new motion: A decreasing exponential plus an increasing exponential gives a catenary curve.1  Circular motion plus linear motion gives a cycloid. Uniform motion added at right angles to uniformly accelerated motion gives a parabola. Two simple harmonic motions added together in parallel gives beats. Two simple harmonic motions added together at right angles gives Lissajous figures.   Students can easily build pieces of apparatus to demonstrate the last two cases. Below, I describe a device for adding together two simple harmonic motions (SHMs) in parallel to give beats and provide some history. The modern apparatus to do this is shown in Fig. 1. Parts of the apparatus in this figure can then be used to make a device that produces simple Lissajous figures. The resulting apparatus is shown in Fig. 2.

Pengarang	:	-
Nama Majalah/Jurnal	:	The Physics Teacher
Volume / Edisi	:	62 (No. 3)
Halaman	:	191–193
Abstrak	:	This paper presents a new and simple methodology to measure the magnitude of gravitational acceleration using a smartphone magnetometer sensor. In this way, we determine the temporal behavior of the magnet’s position previously fixed at different spacings along a ruler in a free-fall movement. The experimental data are interpreted within the theoretical model of the free fall of bodies to determine the magnitude of the gravitational acceleration. Results show a value close to those obtained by similar methods using other smartphone sensors and a theoretical model near Earth’s surface. Thus, we show a suitable methodology for the classroom, laboratory, or home experimental and inquiry activities.

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