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The impact of TYC physics programs on STEM and Non-STEM majors
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| Pengarang | : | Sherry Savrda |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 62 (No. 9) |
| Halaman | : | 790-791 |
| Abstrak | : | In two previous columns,1,2 we looked at the importance of community colleges in general, in terms of enrollment and diversity, and on the impact of two-year college (TYC) physics programs on the physics profession. But most students enrolled in our physics courses are not physics majors. What is the impact of our courses on those students, both STEM majors and non-STEM majors? |
Spooky science: Turning purple to orange
| Pengarang | : | Fenty |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 62 (No. 9) |
| Halaman | : | 788-789 |
| Abstrak | : | Small LED “fairy” lights are now quite common and cheap: around $10 for a strand of 30 lights powered by 3 AAA batteries. Halloween fairy lights can be all purple, all orange, or alternating purple and orange. If you have a strand of these lights with the purple LEDs [Fig. 1(a)], you can “magically” turn purple light into orange light! How? Using a bit of extra virgin olive oil and employing the phenomenon of fluorescence of extra virgin olive oil, which contains high concentrations of chlorophyll.1,2 While previous articles make use of blue-violet and green lasers, you can do the same thing at home using holiday decorations you might already have on hand |
Use of a smartphone as a density measuring device
| Pengarang | : | Sanjoy Kumar Pal; Soumen Sarkar; Pradipta Panchadhyayee |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 62 (No. 9) |
| Halaman | : | 786-787 |
| Abstrak | : | In this paper, we propose a simple method of measuring the density of a solid material. We have used the pressure sensor of a smartphone as a pressure-measuring device. By measuring the values of pressure when a solid object is in air and also when it is fully immersed in a nonreactive liquid, we have determined the density of the object. |
Oscillations and Waves
| Pengarang | : | Miguel Lagos; Rodrigo Paredes; Milton Elgueta; Mario Molina |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 62 (No. 9) |
| Halaman | : | 782-785 |
| Abstrak | : | Oscillations and waves are prevalent in the realm of physical sciences, finding applications across a wide range of technical fields. Waves can be observed everywhere, primarily due to the fact that the lowest-energy states of most spatially extended physical systems tend to exhibit wave-like characteristics. Oscillation can be regarded as a fundamental component of wave motion. It is evident in various scenarios, such as the movement of a suspended object, subtle fluctuations in air pressure within a noisy environment, or the gentle ripples on the surface of a quiet pond. Even in more intricate systems, like the dynamics of the electromagnetic field, we consistently observe the tangible consequences of oscillations and waves. |
Enhancing Student Learning of the Physics of the Human Eye in the Context of Computer Vision Syndrome During COVID-19
| Pengarang | : | Liang Zeng; Guang Zeng |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 62 (No. 9) |
| Halaman | : | 779-781 |
| Abstrak | : | This paper describes a pedagogy that deepened student learning of the physics of the human eye and instilled strategies to reduce computer vision syndrome (CVS), a public health issue worsened by increased technology use during the COVID-19 pandemic. Students discussed the relationship between screen time and symptoms of computer-related vision problems, highlighting the important role of physics in educating themselves and the public on the topic. |
The Unexpected Stability of the Sun and the Unexpected Instability of White Dwarfs
| Pengarang | : | Friedrich Herrmann |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 62 (No. 9) |
| Halaman | : | 776-778 |
| Abstrak | : | The Sun does not explode like a hydrogen bomb, as one might expect. When a white dwarf accretes matter, it is shrinking, not getting bigger, as one might expect. I show that both effects are due to Newton’s law of gravitation. I discuss the behavior of two different types of celestial bodies: the Sun (and other Sun-like stars) and white dwarfs. |
Measuring Speed Independence of Dry Sliding Friction
| Pengarang | : | Lazar Radenkovi?; Goran Radenkovi? |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 62 (No. 9) |
| Halaman | : | 772-775 |
| Abstrak | : | In introductory physics courses, it is typically assumed that dry sliding friction is independent of the relative speed of the contact surfaces. However, research in tribology indicates that this assumption is not always correct.1,2 There has been little investigation on this topic in physics education literature,3–5 and the textbooks rarely go beyond the f = μN equation when sliding friction is concerned.6–8 The main objective of this paper is to present a method for determining whether dry sliding friction force depends on the sliding speed of the contact surfaces. To this end, we designed and conducted an experiment in which we varied the relative speed of the contact surfaces from approximately 0.5?m/s to 6?m/s and measured the resulting sliding friction force. |
An Open Inquiry-Based Lesson Sequence for Teaching the Subject of Motion and Force
| Pengarang | : | Tekin Güler; Muammer Çal?k |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 62 (No. 9) |
| Halaman | : | 768-771 |
| Abstrak | : | The aim of this study is to design an open inquiry-based lesson sequence to teach the subject of “motion and force” in primary school. Through a design-based research method, the present study followed inquiry-based research phases and developed related activities. Then, the lesson sequence was pilot tested with fourth-grade students drawn from a public school. After two successive pilot studies, the lesson sequence and related activities were revised. The findings of the pilot studies and experts’ views showed that the lesson sequence is appropriate for fourth-grade students and illustrates how to adapt an open inquiry into a primary school science course. The current study suggests that an open inquiry-based lesson sequence can be used to facilitate student learning and support meaningful learning. |
Newtons Law of Cooling and the Size of Sifrhippus sandrae, the Earliest Horse, During the Paleocene Eocene Thermal Maximum
| Pengarang | : | Scott Lee |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 62 (No. 9) |
| Halaman | : | 766-767 |
| Abstrak | : | Newton’s law of cooling is a mainstay of introductory physics courses and is usually discussed in the context of heat loss through the walls of a building during winter. These courses typically have about 150 students who are majors in physics, chemistry, life sciences, and pre-pharmacy. Here we present a fascinating application of this law to the earliest horse, the tiny (∼5 kg) Sifrhippus sandrae (see Fig. 1), whose fossilized remains first appear in deposits about 56 million years old. |
From Kinematics to the Formulas for the Radius of Curvature
| Pengarang | : | Vardan Manukyan; Gagik Nikoghosyan |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 62 (No. 9) |
| Halaman | : | 763-765 |
| Abstrak | : | In order to formulate physical quantitative laws and solve physical problems, mathematics is a necessary tool. However, sometimes physical ideas can also aid in obtaining mathematical results and solving mathematical problems in a unique and interesting way (see Ref. 1 and references therein; see also Refs. 2–5). These approaches are nonstandard and motivating, and introduce students to the interdisciplinary connections between physics and mathematics. This article uses kinematic representations through the “physical method” to derive some well-known mathematical expressions for determining the radii of curvature of two-dimensional curves. |