scholarly journals PENGGUNAAN PARADIGMA GAYA-REAKSI DAN PENDEKATAN ANALOGI UNTUK MENINGKATKAN PEMAHAMAN KONSEP GAYA GESEK BAGI MAHASISWA CALON GURU FISIKA (STUDI KASUS PERKULIAHAN FISIKA DASAR I)

2014 ◽  
Vol 9 (2) ◽  
Author(s):  
Joni Rokhmat
Keyword(s):  
Friction Force ◽  
Front Wheel ◽  
Human Being ◽  
Reactive Force ◽  
Fundamental Physics ◽  
Study Results ◽  
Newton’S Laws

Abstrak: Hasil studi dalam perkuliahan Fisika Dasar I memperlihatkan bahwa mahasiswa calon guru fisika pada umumnya memiliki konsepsi keliru tentang gaya gesek. Konsepsi keliru tersebut meliputi penentuan syarat terjadinya gaya gesek antara dua benda, jenis gaya gesek (statik atau kinetik), arah gaya gesek, serta nilainya. Melalui pembahasan fenomena orang berjalan dan mobil bergerak dengan penggerak roda depan, dan menggunakan pendekatan paradigma gaya gesek sebagai gaya-reaksi dan pendekatan analogi, serta hukum-hukum Newton tentang gerak terbukti dapat mengubah konsepsi keliru mahasiswa tersebut menjadi konsepsi yang benar. Akhir pembelajaran menggunakan dua pendekatan tersebut terbukti mahasiswa memiliki pemahaman gaya gesek yang lebih sempurna, khususnya berkenaan dengan syarat terjadinya gaya gesek, penentuan jenis, arah, dan nilai gaya gesek.Kata kunci: Pendekatan paradigma gaya gesek sebagai gaya-reaksi, pendekatan analogi, serta syarat kemunculan, jenis, arah, dan nilai gaya gesek. Abstract: The Study results in Fundamental Physics I lecturing showed that pre service Students of Physics in general have misconceptions about friction force. The misconceptions include determining of requirements of friction force happening, sort of the friction force (static or kinetic), direction and value of the friction force. Through discussions of the phenomena of a human being walking and a car moving with front wheel activator, and used approaches of a paradigm that friction force as a reactive-force and analogy, also used the Newton’s laws about movement it proved that those could change the misconceptions to be true conceptions. The last of lecturing using the two approaches the Students have beter understanding of friction force, especially with rescpet to the requirements of it’s happening, determining it’s sorts (static or kinetic), direction, and it’s value.Keywords: Approache of a paradigm that friction force as a reactive-force, analogy approache, also requirements of it’s happening, determining of sort, direction, and value of the friction force.

scholarly journals Developing of Multiculturalism in the Pesantren: Study on KH Abdul Muhaimin and the Pesantren of Nurul Ummahaat

2016 ◽  
Vol 5 (2) ◽  
pp. 305
Author(s):  
Syarif Hidayatullah
Keyword(s):  
Human Being ◽  
Growing Up ◽  
Study Results ◽  
Theological Perspective ◽  
Challenges And Opportunities ◽  
The Government ◽  
New Policies

The article describes a case study on KH Abdul Muhaimin and his Pesantren of Nurul Ummahat who has a curious awareness and some real actions to growing up multiculturalism consciousness. The study results that Kyai recognizes a vision of the pesantren with three words: Modernity, Moderates, and Humanity, that viewed to respond any challenges and opportunities of the modernization and the globalization, including multiculturalism awareness. So, the Kyai elaborates about nationalism based on theological perspective, beside sociological and cultural. Theologically, the Kyai views that any human being must be recognized rightly at all, and do not depend on their position and entity. In this context, the Kyai and his Pesantren of Nurul Ummahat had done several actions, namely: academic discussions, dialogues among religious peoples, launching of FPUB, the Toya Mili movement, and the Palem Consortium. The article intends become a solution for the government, especially in creating new policies to respond radicalism in the pesantrens.

scholarly journals Destruction of Communicative Pragmatics in Contemporary Absurdist Dramaturgic Texts

2020 ◽  
Vol 27 (2) ◽  
pp. 195-212
Author(s):  
Valeria Koroliova ◽  
Iryna Popova
Keyword(s):  
Formal Structure ◽  
Human Being ◽  
Active Participant ◽  
Arbitrary Choice ◽  
Study Results ◽  
Chaotic Nature ◽  
Linguistic Units ◽  
Communicative Role ◽  
Thematic Coherence

The aim of the article is characteristics of mechanisms of pragmatics distraction in communication of active participants of modern Ukrainian plays with features of the theatre of the absurdity. Structural and contextual mechanisms of dialogic speech depragmatization are singled out on factual material. In a dramatic dialogue absurdity is explained as a purposeful instruction to convey the thought about illogicalness and chaotic nature of reality, the aimlessness of a human being. The main methods of the study are descriptive, context-interpreting and presuppositional. Study results. One of absurdity occurrence mechanisms is depragmatization – purposeful non-normative usage of language pragmatic resources. We identify structural and contextual violations within depragmatization. Structural violations are characteristic for an absurdist drama in which characters’ cues do not have illocutionary and thematic coherence. Another type of structural violations is conscious violations of formal structure of linguistic units. Role exchange, during which an active participant takes over someone else’s communicative role, is an example of contextual depragmatization. Within contextual violations we also identify the group of cognitive violations which is based on non-observance of causally consecutive and logical connections. Anomalies based on an arbitrary choice of language stylistic means, which are uncoordinated with general principles of stylistic formalization of the text, are considered the contextual variety of depragmatization. Conclusions. Structural and contextual communicative violations are used by playwrights to activate the sense of the situational absurdity depicted in a work. Active participants of drama of the absurdity communicate without communicative purpose and taking into account situational needs, which results in actualization of pragmatic potential of used linguistic units, falsification of meaningful speech.

Relation Between End-Effector Impedance and Joint Friction of Statically-Balanced Mechanisms

2013 ◽  
Author(s):  
Wenwu Xiu ◽  
Ou Ma
Keyword(s):  
Optimal Design ◽  
Friction Force ◽  
Dynamic Performance ◽  
Force Model ◽  
Neurological Rehabilitation ◽  
Reduced Gravity ◽  
End Effector ◽  
Joint Friction ◽  
Study Results ◽  
Passive Compensation

Statically-balanced mechanisms have been widely used for passive compensation of gravity loads in many applications including neurological rehabilitation and micro-/reduced-gravity simulation. For these applications, it is desirable that the used mechanism has minimal impedance the interacting human can feel. Impedance of a statically-balanced mechanism is contributed by many factors including the payload on the end-effector and the joint friction. This paper studies the relation between the end-effector impedance and the load-dependent joint friction for statically-balanced mechanisms. In the study a load dependent joint friction force model was developed. With the model, contribution of the end-effector load or payload on the joint friction can be evaluated, from which the end-effector impedance of the mechanism caused by the joint friction can be computed. The study results are applied to the analysis of a reduced-gravity simulator to evaluate the effect of the joint friction on the end-effector impedance of the mechanism. The findings of the study can help the assessment of the dynamic performance and also help the optimal design of statically-balanced mechanisms.

FRICTION FORCE OF THE NATURAL LEATHER CUTTING PROCESS

Tribologia ◽  
2019 ◽  
Vol 288 (6) ◽  
pp. 81-85
Author(s):  
Jacek Przepiórka
Keyword(s):  
Friction Coefficient ◽  
Cutting Force ◽  
Technological Process ◽  
Friction Force ◽  
Mechanical Process ◽  
Cutting Machine ◽  
Study Results ◽  
Optimal Force ◽  
Different Shapes ◽  
Cut Elements

Cutting natural leather is a first stage of a technological process of leather goods. It consists of dividing flat materials into shoe components. Cutting can be done by hand or mechanically. Cutters are the main cutting device in mechanical process. During utilization of cutters, the durability of its usage is an important issue. To increase its endurance, optimal force conditions are required. These depend on the following: the friction coefficient between cutting machine and cut material, the angle of sharpening of cutter, the blunting of the edge, using a cutting pad, and the type and kind of steel of which is produced. Friction is a component of a cutting force and its value depends on several factors, one of which is shape of the cutter. It is a parameter often ignored in the literature; however, according to the studies conducted by the authors, the value of the friction during cutting depends on the shape of the cutter. In this study, results of force value measurements required to cut elements of different shapes with equal circumferences with steel cutters are presented.

scholarly journals Penanaman Karakter Positif Pelajar Melalui Pembahasan Fenomena-Fenomena Fisika dan Pendekatan Analogi (Hasil Kajian Perkulihan Fisika Dasar)

2017 ◽  
Vol 1 (1) ◽  
pp. 52
Author(s):  
Joni Rokhmat
Keyword(s):  
Electromagnetic Induction ◽  
Human Being ◽  
Fundamental Physics ◽  
Flowing Fluid ◽  
Good Samaritan ◽  
The Mind

The discussion results of Fundamental Physics I lecturing, especially the 1st Newton law about movement, law of Lenz, electromagnetic induction, and law of Bernoulli about pressure of flowing fluid show that in the concepts implicitly there is an action-reaction relation between objects. We could analogize these phenomena to the interaction between human being, in the contex of learning we can analogize it to the interaction between educator and students. When the interaction between objects softly occurs (“persuasive”) the reaction is not emerge but when it happen quictly the reaction emerges and it against the change caused by the action. The implementation of the discussion of Physics concept and analogy approach usefull to implant positive characters to the students. The positive characters include honesty, responsibility, respect, empaty, self restraint, modesty, patient, no despondently, diligent, love, and good samaritan, also make the values to be a habit in the mind, feeling, and in action.

A Swinging and Self-Actuating Friction Drive Device Used in Large-Scale Rotary Devices

2020 ◽  
Vol 13 (1) ◽  
pp. 41-48
Author(s):  
Desheng Chen ◽  
Qiaoning Xu
Keyword(s):  
Friction Force ◽  
Large Scale ◽  
Design Principles ◽  
Geometric Parameters ◽  
New Method ◽  
Contact Load ◽  
Appreciable Amount ◽  
Reactive Force ◽  
Friction Forces ◽  
Input Torque

Background: Large-scale rotary devices often employ friction drives in order to be manufactured easily and usually select a large driving radius to reduce the friction forces needed. In traditional devices, the driver and driven friction wheels are required to be of higher roundness to avoid slipping between them. This makes the driven friction wheel difficult to be machined. In addition, generating adequate contact load between contacting surfaces is essential for friction drives, and the best way to achieve it is self-actuating loading. Objective: The purpose of this paper is to propose and analyze a patent about a new friction drive device, in which the driver friction wheel can roll along with the driven friction wheel throughout, and the contact load between the driver and driven friction wheels can be generated on the torque demand. Methods: By using two swinging gearboxes, the two driver friction wheels are both swinging, and thus both can roll along with the driven friction wheel floatingly. Therefore, the driven wheel can have some deviation in roundness. Besides, this design offers a condition to construct a torque-actuated loading mechanism. Driven by the input torque, each driver wheel turns and exerts a friction force on the driven wheel, and then the driven wheel applies a reactive force to each driver wheel. This reactive force tends to pull the driver wheel to the driven wheel, producing a wedging action. Thus, an appreciable amount of contact load between the driver and driven wheels will be generated. Results: The results show the contact load between the driver and driven friction wheels is directly proportional to the resistant torque acting on the friction drive device. The results also show that a “frictional locking” condition for the device to avoid slipping between the driver and driven friction wheels is needed and it depends on the geometric parameters of the device. Conclusion: A swinging and self-actuating friction drive device is developed by using two swinging gearboxes. Design principles were described and a design example for this friction drive device was demonstrated. This kind of friction drive device not only offers an alternative way to drive large-scale rotary devices, but also develops a new method to realize self-actuating loading for friction drives.

scholarly journals Love in Nursing: A Concept Analysis

2020 ◽  
Vol 9 (2) ◽  
pp. 113-119
Author(s):  
Mohsen Adib Hajbaghery ◽  
Shahnaz Bolandian
Keyword(s):  
Nursing Care ◽  
Nursing Practice ◽  
Web Of Science ◽  
Concept Analysis ◽  
Time Limit ◽  
Google Scholar ◽  
Human Being ◽  
Negative Consequences ◽  
Study Results ◽  
Values And Beliefs

Introduction: Professional nursing is based on caring. Care is a combination of love and respect in interacting with others. There are many concerns about nursing care without love. However, the concept and meaning of love in nursing have not been paid the due attention. This study analyzed the concept of love in nursing. The aim of this study is to describe and discuss the concept of love in nursing. Methods: A concept analysis was conducted using the 8-step Walker and Avant’s model. Databases such as SID, PubMed, Web of Science, CINHAL, SCOPUS and Google Scholar were searched. The terms “love”,”concept analysis” and “nursing” were used for searching in international sources. No time limit was considered in searching the databases and all studies were published until December 2017. In the initial search, 142 articles were found but finally eight articles remained relevant and entered the study. Results: The authors did not find a special independent tool to measure love in nursing. Therefore, we define love in nursing as follows: the combination of nursing care with a sense of responsibility, benevolence, attention and concern, respect, and understanding of others as a human being, regardless of their negative consequences for themselves. Conclusion: Understanding the meaning of love in nursing can promote nursing practice in two ways. First, the nurses are examining their values and beliefs. Second, they find out how to interact with patients.

scholarly journals Evaluation of the use of the Moodle Platform for Fundamental Physics Lectures at University

2021 ◽  
Vol 7 (2) ◽  
pp. 169-176
Author(s):  
Mutoharoh Mutoharoh ◽  
Diah Ambarwulan
Keyword(s):  
Online Courses ◽  
Student Feedback ◽  
Fundamental Physics ◽  
Physics Courses ◽  
Newton's Law ◽  
Study Results ◽  
Newton’S Law ◽  
E Learning ◽  
Almost All ◽  
Free Open Source

Almost all countries in the world use E-Learning as a teaching medium. Moodle is a Learning Management System (LMS), a free, open-source platform designed to assist educators in creating online courses with dynamic interaction opportunities. In this study, an evaluation of the use of Moodle was carried out, especially in fundamental physics courses (Newton's Law). Evaluation is given by distributing online questionnaires using Google Forms as a database to store answers, collect feedback, and as statistical software to provide analysis of the effect of using Moodle according to students' opinions or perspectives. The study results show that students experience problems in taking tests/quizzes using SEB due to the instability of the internet signal. One of the reasons is that students also have to join the exam zoom simultaneously. Meanwhile, the Newton's Law material provided is very contextual and rich in sample questions, including providing student feedback which is considered good.

The Influence of a Variable Normal Load on the Forced Vibration of a Frictionally Damped Structure

1986 ◽  
Vol 108 (2) ◽  
pp. 300-305 ◽  
Author(s):  
C.-H. Menq ◽  
J. H. Griffin ◽  
J. Bielak
Keyword(s):  
Turbine Blade ◽  
Friction Force ◽  
Normal Load ◽  
Maximum Amplitude ◽  
Dynamic Coupling ◽  
Stick Slip ◽  
Study Results ◽  
Long Time ◽  
Response Increase ◽  
Lift Off

An approximate procedure is developed for calculating the steady-state response of frictionally damped structures for which the normal load across the friction interface consists of a constant force and a force that varies linearly with the vibratory displacement. Such situations occur quite frequently in practice, as, for example; in the case of shrouded fan blades or in certain types of turbine-blade friction dampers. Depending on the magnitudes of the constant and the variable normal loads, the friction element will either stick, slip, or lift off at various intervals during a cycle of oscillation. The various possibilities are considered in the present study. Results from the approximate method are compared with “long-time” solutions obtained from a conventional transient analysis of the problem in order to assess the accuracy of the proposed procedure. As an application, the new method is then used to study the influence of the dynamic coupling on the optimization of the friction force in turbine blade dampers. Results show that the optimum friction force and the maximum amplitude of the response increase with dynamic coupling.

Models of comets with strongly variable nongravitational effects

1999 ◽  
Vol 173 ◽  
pp. 381-387
Author(s):  
M. Królikowska ◽  
G. Sitarski ◽  
S. Szutowicz
Keyword(s):  
Cometary Nucleus ◽  
Spin Axis ◽  
Reactive Force ◽  
Orbital Elements ◽  
Cometary Nuclei ◽  
Short Period ◽  
Basic Parameters ◽  
Polar Radius ◽  
Cometary Activity ◽  
Nongravitational Effects

AbstractThe nongravitational motion of five “erratic” short-period comets is studied on the basis of published astrometric observations. We present the precession models which successfully link all the observed apparitions of the comets: 21P/Giacobini-Zinner, 31P/Schwassmann-Wachmann 2, 32P/Comas Solá, 37P/Forbes, and 43P/Wolf-Harrington. We used the Sekanina's forced precession model of the rotating cometary nucleus to include the nongravitational terms into equations of the comet's motion. Values of six basic parameters (four connected with the rotating comet nucleus and two describing the precession of spin-axis of the nucleus) have been determined along the orbital elements from positional observations of the comets. The solutions were derived with additional assumptions which introduce instantaneous changes of modulus of reactive force,Aand of maximum of cometary activity with respect to perihelion time. The present precession models impose some contraints on sizes and rotational periods of cometary nuclei. According to our solutions the nucleus of 21P/Giacobini-Zinner with oblateness along the spin-axis of about 0.32 (equatorial to polar radius of 1.46) is the most oblate among five investigated comets.

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