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Water Bottle Stability
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| Pengarang | : | Andrew Davis Cahoon |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 61 (No. 9) |
| Halaman | : | 785-787 |
| Abstrak | : | A water bottle can be a useful system for the study of static equilibrium and stability. We have recently seen the fun physics of flipping water bottles explained by Dekker et al.1 The simple act of tipping them over is interesting as well. As a bottle is tipped, the liquid reshapes to find its level. If the center of mass of the system passes over the balance point, the bottle falls over. Otherwise, it is stable and returns to upright. Pahwa et al.2 determined the system center of mass geometrically and compared the theoretical tipping angle with experimental results. |
The Induction Coil
| Pengarang | : | Simanjuntak Pintor |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 59 (No. 9) |
| Halaman | : | 689-691 |
| Abstrak | : | In an earlier article I argued that much of what used to be called “modern physics” stems from the intersection of two earlier technologies: high vacuum and high voltage. In this article I will discuss the induction coil, invented in the 1830s, reinvented in the second half of the 19th century, and still used today to produce the high voltages used to excite gaseous and high-vacuum discharge tubes. |
Archimedes Revisited and Beyond
| Pengarang | : | Terrence Toepker |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 61 (No. 9) |
| Halaman | : | 780-784 |
| Abstrak | : | Almost every general physics text includes a description of the primary forces involved with a floating object, weight and buoyant force. However, the physical orientation of the floating object is rarely discussed. The goal of this paper is to go beyond what Archimedes taught us. Motivation for this paper started with a Physics Today article1 by Henry Pollack describing iceberg orientations. Almost as an aside, the author mentions a floating cube of wood and its nonintuitive orientations. |
Using Math in Physics: 4. Toy models
| Pengarang | : | - |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 59 (No. 9) |
| Halaman | : | 683-688 |
| Abstrak | : | Learning to create, use, and evaluate models is a central element of becoming a scientist. In physics, we often begin an analysis of a complicated system with highly simplified or toy models. In introductory physics classes, we tend to use them without comment or motivation. Some students infer that physics is irrelevant to their understanding of the real world and are discouraged from making the cognitive blend of physics concepts with math symbology essential for making sense of physics. In this paper, I discuss the often-hidden barriers that make it difficult for our students to accept and understand the value of toy models and suggest instructional approaches that can help. |
Over The Top
| Pengarang | : | Carl E. Mungan |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 59 (No. 9) |
| Halaman | : | 680-682 |
| Abstrak | : | Unfortunately this problem is flawed, because if the speed of the car is such that it would lose contact at the crest, then it will lose contact well before that point! In fact, the car would lose traction (i.e., the tires will begin to slip2) even earlier, which can lead to a dangerous loss of steering control. The situation is worse still for an unpowered (free rolling) car, because it would travel faster at lower than higher elevations and so it would lose contact with the steeper convex road surface at a yet lower height. |
Open or One-End-Closed Tubes for Beethoven’s Ninth Symphony: Boomwhackers
| Pengarang | : | Muge Aygun; Hasan Sahin K?z?lc?k |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 61 (No. 9) |
| Halaman | : | 777-779 |
| Abstrak | : | A symphony can provide a context for teaching about the frequency of sound waves in open or one-end-closed tubes. A set of Boomwhackers and smartphone applications are sufficient to do this. As an exploratory approach to understanding the frequency of the sound produced in tubes, we can challenge students to play Beethoven’s “Ode to Joy.” Right after that, we can use Boomwhackers again to find the speed of sound. |
An Off-Center, Elastic Collision: Conservation of Kinetic Energy Without a Perfect Coefficient of Restitution
| Pengarang | : | Theodore Baum; Joshua Grossman |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 61 (No. 9) |
| Halaman | : | 774-776 |
| Abstrak | : | We present an analysis of an elastic collision of a ball with a bar that is not necessarily on center. Although the analysis is accessible to students in most introductory high school or college physics courses, such a scenario is not typically treated in introductory textbooks, which are far more likely to treat totally inelastic collisions with a rotatable object, such as the case of a ballistic pendulum. In contrast to those textbook scenarios, which involve one or two conservation principles, this case study requires invocation of three conservation principles: linear momentum, angular momentum, and kinetic energy. Even though total kinetic energy is conserved, part of the translational kinetic energy is converted into rotational kinetic energy. Our approach uses (1) judicious selection of a reference frame and (2) dimensionless ratios of parameters, allowing a simple analysis that identifies key parameters upon which universal behaviors depend. |
Get Behind the Wheel: Esports and Physics Misconceptions
| Pengarang | : | Armand Buzzelli; Gavin Buxton; Marina Fontolan; Alexander Gagnon |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 61 (No. 9) |
| Halaman | : | 770-773 |
| Abstrak | : | Some students have difficulty understanding forces, velocities, and accelerations in friction and circular motion problems. Bodily kinesthetic intelligence is the potential of using physical interactions to solve problems or to develop insights. In a recent physics lecture, we made use of our esports suite and physically realistic racing car simulations as an opportunity for students to physically feel and experience the physics of extreme driving conditions during a class period. We found the use of increasingly popular esports facilities to be complementary to in-class instruction. |
Learning Electromagnetism through a Playful County Fair Game Project
| Pengarang | : | Arturo Gregorio Pazmino; Luis Israel Pabón; Esther Desiree Gutiérrez M.; Erick Lamilla Rubio; Eduardo Montero |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 61 (No. 9) |
| Halaman | : | 766-769 |
| Abstrak | : | Project- or problem-based learning (PBL) is a methodology that makes students take an active role in their knowledge construction, improving the learning process. At the same time, PBL help students to develop soft and social skills that are important for their careers and professional lives. In this work, an entertaining game project based on an introductory undergraduate physics course is presented, in which students build an experimental prototype based on a traditional county fair game, “High Striker.” To fulfill the project’s requirements, students need to use mainly electromagnetism concepts such as Biot–Savart law, Ampere’s law, and Faraday’s law; and classical mechanics physics concepts such as energy conservation and collisions. |
The Mechanical Paul Trap: Introducing the Concept of Ion Trapping
| Pengarang | : | Sebastian Kilde Löfgren; Ricardo Méndez Fragoso; Jonathan Weidow; Jonas Enger |
| Nama Majalah/Jurnal | : | The Physics Teacher |
| Volume / Edisi | : | 61 (No. 9) |
| Halaman | : | 762-765 |
| Abstrak | : | Nobel laureate Wolfgang Paul showed, back in the 1950s, that charged particles can be trapped using alternating electric fields.1 This technique is commonly referred to as a Paul trap or a radiofrequency trap (RF-trap) and is used in various areas of modern physics. This paper presents a 3D-printed mechanical Paul trap, a naive simulation of the system in Python, and student investigations. The files for the 3D-printed trap are available for download and print,2 and the code for the simulation is available to run and tinker with. |