Possible misconceptions about solid friction

Şahin, Kızılcık, Hasan; Aygün, Müge; Şahin, Esin Yağmur; Çelikkanlı, Nuray Önder; TÜRK, Osman; Taşkin, Tuğba; Güneş, Bilal

doi:10.1103/physrevphyseducres.17.023107

Cited by 10 publications

(9 citation statements)

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“…The first example is the wheel, from the early ancient shapes to the modern uses and designs. Rolling bearings are most notable and widespread; their importance is confirmed by the numerous comprehensive theoretical and experimental studies [ 6 , 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Validation of Nonlinear Dependence of Rolling Friction Moment on the Normal Force for Elastic Materials

2022

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Analogous to the Amonton–Coulomb relation, which states the linear dependency between the dynamic sliding friction and the normal reaction, the rolling friction moment is commonly accepted as proportional to the normal reaction in a concentrated point contact. This hypothesis persists since it gives simple dynamic models and also due to difficulties met in experimental estimations of the rolling friction torques. Recent theoretical studies proved that this dependency is nonlinear even for elastic materials. A special rotor is designed, with an adjustable position for the center of mass but with constant mass and constant axial inertia moment. The pure rolling motion of the rotor on an inclined controlled small slope is studied. The angular acceleration of motion is theoretically deduced, assuming that the rolling friction torque is proportional to the normal force raised at a certain power. The deduced theoretical dynamic model evidences the influence of the eccentricity of the rotor upon the acceleration. For the particular case of linear dependency—the exponent of the power equal to one, the law of motion is independent of the configuration of the rotor. Experimental tests were made using the rotor constructed according to the theoretical model. For two positions of the center of mass, the experimental law of motion on the inclined plane is established by a non-contact method and the two different laws obtained to validate the nonlinear dependence rolling friction torque-normal force. The paper validates in an experimental manner the considered nonlinear assumption. The experimental tests concerning the microtopography of the contacting surfaces reveal that the hypothesis required by Hertzian theory, namely smooth contacting surfaces, is not satisfied. Thus, the distribution of pressure on the contact area does not obey the Hertzian semi-ellipsoidal distribution and further experimental tests are required for quantitative findings on the rolling friction torque-normal force relationship.

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Section: Introductionmentioning

confidence: 99%

Validation of Nonlinear Dependence of Rolling Friction Moment on the Normal Force for Elastic Materials

2022

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“…The concept of friction force is given to the seventh-grade level students in terms of middle school science course (MoNE, 2018). Theoretical knowledge related to this concept provides a basis for learning future subjects such as Law of Conservation of Energy and Newton's Laws (Kızılcık et al, 2021). Also, friction force is experienced in daily life with both its positive and negative influences.…”

Section: Introductionmentioning

confidence: 99%

“…The researchers made an investigation with the attendance of physics education students in Indonesia and stated that students' responses in scientific understanding category had the least percentage among all categories. Also, Kızılcık et al (2021) made a thematic analysis of the studies which focused on the understanding of the concept of friction by different age students. As a result of this study, the researchers identified students' misconceptions about friction under four categories as the effects of friction, definition and existence of friction, direction of friction and the type and magnitude of friction.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the misconception "the direction of friction is always opposite to the direction of motion." was determined as the most frequent misconception among students (Kızılcık et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

“…For example, the participants asserted that there was no relation between the friction force and contact surface area which are in contact contrary to the misconception "Friction is depended on the magnitude of the surfaces which are in contact." defined in the literature (Kızılcık et al, 2021). Besides, the participants asserted that "Friction force depends on the type of the surface.…”

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A Suggestion and Evaluation of a STEM Activity about Friction Coefficient for Pre-Service Science Teachers

Ürek

Çoramık

2022

Journal of Computer and Education Research

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In this study, the process of developing and evaluating a STEM activity which can be implemented during Science Teaching Laboratory Practice course in accordance with the 5E Model related to the concept of friction coefficient was addressed. The implementation of the activity was conducted in the form of a case study with the participation of 16 third year pre-service science teachers. Student journal forms and worksheets were utilized for the evaluation of the activity. As a result, it was determined that planned activity could be successfully applied to the pre-service teachers during the weekly course hours of Science Teaching Laboratory Practice course. In addition, positive feedbacks were obtained from pre-service teachers' evaluation for the activity. It is believed that such studies, which establish connections between science and different disciplines, can contribute to the training of qualified science teachers and that such studies should be given more space in science teacher education.

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Development of Instructional Modules to Create Aha Moments in Geotechnical Engineering Courses

Seo

2023

J. Civ. Eng. Educ.

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Possible misconceptions about solid friction

Cited by 10 publications

References 50 publications

Validation of Nonlinear Dependence of Rolling Friction Moment on the Normal Force for Elastic Materials

Validation of Nonlinear Dependence of Rolling Friction Moment on the Normal Force for Elastic Materials

A Suggestion and Evaluation of a STEM Activity about Friction Coefficient for Pre-Service Science Teachers

Development of Instructional Modules to Create Aha Moments in Geotechnical Engineering Courses

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