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Pendulum Motion Damped by Speed-Independent Friction 受速度无关摩擦影响的钟摆运动
The Physics Educator Pub Date : 2021-09-01 DOI: 10.1142/s2661339521500086
C. Mungan
{"title":"Pendulum Motion Damped by Speed-Independent Friction","authors":"C. Mungan","doi":"10.1142/s2661339521500086","DOIUrl":"https://doi.org/10.1142/s2661339521500086","url":null,"abstract":"A pendulum without a supporting string or rod is obtained if a small block or marble is released at the rim of a spherical bowl or cylindrical half-pipe. This setup also applies to the familiar loop-the-loop demonstration. However, the bob will then experience sliding or rolling friction, which is speed independent in contrast to the linear or quadratic air drag which is more commonly used to model damping of oscillators. An analytic solution can be found for the speed of the bob as a function of its angular position around the vertical circular trajectory. A numerical solution for the time that the object takes to move from one turning point to the next shows that it is smaller than it would be in the absence of friction.","PeriodicalId":112108,"journal":{"name":"The Physics Educator","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123553660","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Cometary Panspermia — Overcoming Cultural Constraints 彗星生源论——克服文化限制
The Physics Educator Pub Date : 2021-06-22 DOI: 10.1142/s266133952130001x
N. Wickramasinghe
{"title":"Cometary Panspermia — Overcoming Cultural Constraints","authors":"N. Wickramasinghe","doi":"10.1142/s266133952130001x","DOIUrl":"https://doi.org/10.1142/s266133952130001x","url":null,"abstract":"The importance of distinguishing between hypotheses that are verified by a vast number of predictions and have not been falsified, and conjectures without any compelling evidence is of paramount importance for science educators to keep in mind. This article describes the trajectory of one such hypothesis. The concept of cometary panspermia has been developed over a period of four decades and evidence for it has straddled many scientific disciplines from astronomy, to geology, biology and epidemiology. With an ever-increasing number of predictions of this theory being verified, the question as to why it has not entered mainstream thinking is an intriguing one. I suggest that this resistance is connected with sociological considerations, including a deep cultural hostility to theories that appear to have a foreign or “alien” provenance.","PeriodicalId":112108,"journal":{"name":"The Physics Educator","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125967664","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Teaching Impulse-Momentum Law by Arduino Based STEM Education Material 基于Arduino的STEM教材的脉冲动量定律教学
The Physics Educator Pub Date : 2021-06-22 DOI: 10.1142/s2661339521500062
A. Çoban, M. Erol
{"title":"Teaching Impulse-Momentum Law by Arduino Based STEM Education Material","authors":"A. Çoban, M. Erol","doi":"10.1142/s2661339521500062","DOIUrl":"https://doi.org/10.1142/s2661339521500062","url":null,"abstract":"In this study, a sample application that can be done in a classroom where students are actively engaged in technology, engineering, physics and mathematics in a single educational environment, will be introduced. The relationship between the impulse exerted by the force acting on a vehicle for a certain period of time and the change in the momentum were analyzed using Arduino UNO, Load-cell 1kg sensor, distance sensor and Bluetooth sensor prepared within the scope of STEM education. The ratio of these two physical quantities, which is theoretically equal to unity, was found as [Formula: see text] with the help of the data. The error rate of the data was calculated to be 4.1% despite using highly economical teaching materials.","PeriodicalId":112108,"journal":{"name":"The Physics Educator","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126457575","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Light Inextensible Strings (Thread) Under Tension in the Schwarzschild Geometry 史瓦西几何中张力下的光不可扩展弦(线)
The Physics Educator Pub Date : 2021-06-22 DOI: 10.1142/s2661339521500050
R. Hankin
{"title":"Light Inextensible Strings (Thread) Under Tension in the Schwarzschild Geometry","authors":"R. Hankin","doi":"10.1142/s2661339521500050","DOIUrl":"https://doi.org/10.1142/s2661339521500050","url":null,"abstract":"Light inextensible string under tension is a stalwart feature of elementary physics. Here I show how considering such a string in the vicinity of a black hole, with the help of computer algebra systems, can generate insight into the Schwarzschild geometry in the context of an undergraduate homework problem. Light taut strings minimize their proper length, given by integrating the spatial component of the Schwarzschild metric along the string. The path itself is given by straightforward numerical solution to the Euler–Lagrange equations. If the string is entirely outside the event horizon, its closest approach to the singularity is tangential. At this point the string is visibly curved, surely a memorable and informative insight. The geometry of the Schwarzschild metric induces some interesting nonlocal phenomena: if the distance of closest approach is less than about [Formula: see text], the string self-intersects, even though it is everywhere under tension. Light taut strings furnish a third interpretation of the concept “straight line”, the other two being null geodesics and free-fall world lines. All the software used is available under the GPL.1","PeriodicalId":112108,"journal":{"name":"The Physics Educator","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130261411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Photon Dreams: Years Later 光子之梦:多年以后
The Physics Educator Pub Date : 2021-06-01 DOI: 10.1142/s2661339521300021
A. Smilga
{"title":"Photon Dreams: Years Later","authors":"A. Smilga","doi":"10.1142/s2661339521300021","DOIUrl":"https://doi.org/10.1142/s2661339521300021","url":null,"abstract":"The perspectives of sending a manned space mission to other stars are explored. The conclusions are disappointing: it will never be possible.","PeriodicalId":112108,"journal":{"name":"The Physics Educator","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121690059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
The Scourge of Online Solutions and an Academic Hertzsprung–Russell Diagram 在线解决方案的祸害和学术赫茨普龙-罗素图
The Physics Educator Pub Date : 2021-06-01 DOI: 10.1142/S2661339521500074
J. Overduin, Jacob Buchman, Jonathan Perry, Thomas Krause
{"title":"The Scourge of Online Solutions and an Academic Hertzsprung–Russell Diagram","authors":"J. Overduin, Jacob Buchman, Jonathan Perry, Thomas Krause","doi":"10.1142/S2661339521500074","DOIUrl":"https://doi.org/10.1142/S2661339521500074","url":null,"abstract":"We report on preliminary results of a statistical study of student performance in more than a decade of calculus-based introductory physics courses. Treating average homework and test grades as proxies for student effort and comprehension, respectively, we plot comprehension versus effort in an academic version of the astronomical Hertzsprung–Russell diagram (which plots stellar luminosity versus temperature). We study the evolution of this diagram with time, finding that the “academic main sequence” has begun to break down in recent years as student achievement on tests has become decoupled from homework grades. We present evidence that this breakdown is likely related to the emergence of easily accessible online solutions to most textbook problems, and discuss possible responses and strategies for maintaining and enhancing student learning in the online era.","PeriodicalId":112108,"journal":{"name":"The Physics Educator","volume":"78 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116069700","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Behind the Scenes: The Two-Weeks Stay of Beamline for Schools Winning Students at DESY 幕后:Beamline为DESY获奖学生的两周停留
The Physics Educator Pub Date : 2021-03-01 DOI: 10.1142/S2661339521500013
Enrique Arce-Larreta, Sarah Aretz, Tobias Baumgartner, Cristóvão Silva, Charles Frederick Bonkowsky, Samuel Blaschke Bonkowsky, M. Boselli, Frederiek de Bruine, Ilja de Goede, M. Joos, Isabelle Koster, Thomas Lehrach, Philipp Loewe, Arianna Meinking, August Muller, Thien Lam Ngoc Nguyen, Silas Ruhrberg Estévez, P. Schütze, Kirsten Stadermann, J. Weening
{"title":"Behind the Scenes: The Two-Weeks Stay of Beamline for Schools Winning Students at DESY","authors":"Enrique Arce-Larreta, Sarah Aretz, Tobias Baumgartner, Cristóvão Silva, Charles Frederick Bonkowsky, Samuel Blaschke Bonkowsky, M. Boselli, Frederiek de Bruine, Ilja de Goede, M. Joos, Isabelle Koster, Thomas Lehrach, Philipp Loewe, Arianna Meinking, August Muller, Thien Lam Ngoc Nguyen, Silas Ruhrberg Estévez, P. Schütze, Kirsten Stadermann, J. Weening","doi":"10.1142/S2661339521500013","DOIUrl":"https://doi.org/10.1142/S2661339521500013","url":null,"abstract":"In a previous paper1 the BL4S science competition has been presented from the technical point of view. This paper focuses on the organizational aspects of the period that the winning teams spent at DESY to perform their experiments. Together with a description of the event, this paper provides the unique point of view of the participants.","PeriodicalId":112108,"journal":{"name":"The Physics Educator","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122494753","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 3
Author Index Volume 2 (2020) 作者索引第2卷(2020)
The Physics Educator Pub Date : 2020-12-01 DOI: 10.1142/s2661339520990012
{"title":"Author Index Volume 2 (2020)","authors":"","doi":"10.1142/s2661339520990012","DOIUrl":"https://doi.org/10.1142/s2661339520990012","url":null,"abstract":"","PeriodicalId":112108,"journal":{"name":"The Physics Educator","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122263593","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Functional 3D-Printable Magnet Model of the ATLAS Toroid ATLAS环面功能3d打印磁体模型
The Physics Educator Pub Date : 2020-09-01 DOI: 10.1142/s2661339520200024
J. Woithe, Alexandra Jansky, O. Keller, Tiago Gonçalves
{"title":"A Functional 3D-Printable Magnet Model of the ATLAS Toroid","authors":"J. Woithe, Alexandra Jansky, O. Keller, Tiago Gonçalves","doi":"10.1142/s2661339520200024","DOIUrl":"https://doi.org/10.1142/s2661339520200024","url":null,"abstract":"The ATLAS detector is the largest particle detector at the LHC and one of the most complex machines ever built. It allows precise measurements of particles emanating from proton collisions. Due to its complexity, introducing the ATLAS detector in the high-school physics classroom can be challenging. Nonetheless, we show how to use 3D printing to provide a hands-on classroom activity by constructing a functional 3D model of the toroidal ATLAS magnet system. This model can be used to discover, visualize and explain the shape of a toroidal magnetic field and to start a discussion about the role of magnetic fields in particle detectors in general.","PeriodicalId":112108,"journal":{"name":"The Physics Educator","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132393601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Highschooler’s Guide to GeV-Range Electromagnetism 高中生gev范围电磁学指南
The Physics Educator Pub Date : 2020-09-01 DOI: 10.1142/s2661339520500134
S. Chatterji, Aayush Desai, Aditya Dwarkesh, Anushree Ganesh, Ameya Kunder, P. Malhotra, Roshni Sahoo, Jinal Shah, K. Velmurugan, M. Joos, Cristóvão Silva, G. Morello
{"title":"A Highschooler’s Guide to GeV-Range Electromagnetism","authors":"S. Chatterji, Aayush Desai, Aditya Dwarkesh, Anushree Ganesh, Ameya Kunder, P. Malhotra, Roshni Sahoo, Jinal Shah, K. Velmurugan, M. Joos, Cristóvão Silva, G. Morello","doi":"10.1142/s2661339520500134","DOIUrl":"https://doi.org/10.1142/s2661339520500134","url":null,"abstract":"The following article has been written primarily by the high school students who make up the team “Cryptic Ontics”, one of the two winning teams in the 2018 edition of CERN’s Beamline for Schools (BL4S) competition, and is based on the set of experiments the students endeavoured to conduct over the course of a two-week period at CERN. Reconstructing influential physical theories from scratch often helps in uncovering hitherto unknown logical connections and eliciting instructive empirical checkpoints within said theory. With this in mind, in the following article, a top-down reconstruction (beginning with the experimental observations and ending at the theoretical framework) of the Lorentz force equation is performed, and potentially interesting questions which come up are explored. In its most common form, the equation is written out as: [Formula: see text]. Only the term that includes the magnetic field [Formula: see text] will be dealt with for this article. The independent parameters we use are (i) the momenta of the particles, (ii) the charge (rather, the types) of particles, either positive or negative, and (iii) the current passing through the dipole generating the electromagnetic field. We then measure the angle by which particles get deflected while varying these three parameters and derive an empirical relationship between them.","PeriodicalId":112108,"journal":{"name":"The Physics Educator","volume":"8 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130449269","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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