A new observation about rolling motion

Sharma, Natthi L.

doi:10.1088/0143-0807/17/6/009

Cited by 3 publications

(5 citation statements)

References 2 publications

(3 reference statements)

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“…For a tolerance of ±0.04 radians, points with velocity vectors v ij that are collinear with r P − r ij are noted with large black dots in 4, showing a very close correspondence with the highlighted points. Thus, Sharma's observation [6] has been verified experimentally.…”

Section: Experiments 1: Validation Of Sharma's Observation About Rollingmentioning

confidence: 68%

“…One such characteristic was identified in this journal just over a decade ago [6]. A photograph of a rolling spoked bicycle wheel (on page 247 of Fundamentals of Physics) is blurred due to its motion [1].…”

Section: Introductionmentioning

confidence: 95%

“…The purpose of the figure is to show that more blurring occurs in the top half of the wheel, because it is moving faster than the bottom half. Sharma additionally observed a circular region between the point of contact and centre of the wheel where there was no blurring of spokes [6]. He went on to provide an explanation for this: there is a set of points with instantaneous velocities directed at or away from the centre of the wheel and these points form a circle whose diameter connects the centre of the wheel to the wheel's point of contact.…”

Section: Introductionmentioning

confidence: 99%

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Rolling reloaded

Jones¹,

Nieminen²

2008

Eur. J. Phys.

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Not so long ago a new observation about rolling motion was described: for a rolling wheel, there is a set of points with instantaneous velocities directed at or away from the centre of the wheel; these points form a circle whose diameter connects the centre of the wheel to the wheel's point of contact with the ground (Sharma 1996 Eur. J. Phys. 17 353–6). We provide a detailed experimental verification of this observation, collecting 3D data from a rolling wheel with a commercially available optical tracking system. We also extend the observation to a generalized form: for a rolling wheel, there is a set of points with instantaneous velocities directed at or away from any point P; these points form a circle whose diameter connects the point P to the wheel's point of contact with the ground. This generalization is also verified experimentally.

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Section: Experiments 1: Validation Of Sharma's Observation About Rollingmentioning

confidence: 68%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Rolling reloaded

Jones¹,

Nieminen²

2008

Eur. J. Phys.

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“…For example, a photograph of a bicycle wheel in motion showed that the velocity of the rolling wheel at the contact point with the ground is zero [20]. Foong and Lim [21] showed that on the basis of a photograph alone it is possible to correctly estimate the density of a watermelon floating in a pail of water.…”

Section: Review Of Relevant Literaturementioning

confidence: 99%

Using photographs to elicit student ideas about physics: The case of an unusual liquid-level phenomenon

2014

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This work is aimed at exploring some pedagogical opportunities of using photographs in physics instruction. In our study, the photography has been used for eliciting and probing students' ideas regarding the physics of fluids in noninertial frames of reference and under conditions of equilibrium. The study involved a heterogeneous sample of 235 secondary school students, 41 physics students, and 48 physics teachers. They were presented with a photograph of a wine glass filled with liquid whose surface appeared inclined. The students were asked to comment on the reality of the phenomenon captured in the photograph, and the teachers were asked to predict the students' responses. The results showed that about half of the students had a complete or partially complete understanding of the physical ideas and that their practical and conceptual knowledge was not dependent on their education level or curriculum followed. Most of the respondents found the task interesting and relevant.The results indicate that the teachers' expectations regarding students' understanding of physics often significantly depart from reality. We suggest that physics teachers include some photography-based problems and discussions in their classes. This could encourage a broad participation of students with different levels of abilities. PACS Nos.: 01.40.Fk, 01.40.gb, 1.55.+b.Résumé : Ce travail vise à explorer les méthodes d'enseignement en physique basé sur la photographie. Nous avons étudié, à l'aide la photographie, la compréhension de la physique des fluides dans des cadres non inertiels de référence et dans des conditions de équilibre. L'étude a porté sur un échantillon hétérogène de 235 lycéens, 41 étudiants en physique et 48 en physique enseignants. Ils ont été présentés avec une photo d'un verre de vin rempli de liquide dont la surface est apparu incliné. Les étudiants ont été invités à se prononcer sur la réalité du phénomène capturé dans la photographie. À l'aide de d'une questionnaire les enseignants ont été invités à prévoir les réponses des élèves. Les résultats ont montré que près de la moitié des étudiants a eu un compléter ou partiellement compréhension complète des idées physiques et que leurs connaissances pratiques et théoriques était ne dépend pas de leur niveau d'éducation ou de programme d'études. La plupart des répondants ont trouvé la tâche intéressante et pertinente. Les résultats indiquent que les enseignants les attentes en ce qui concerne les étudiants la compréhension de la physique souvent de manière significative s'écarter de la réalité. Nous suggérons que les professeurs de physique comprennent certains problèmes et discussions photographie à base de leur programme d'études. Cela pourrait encourager la participation des étudiants qui ont peu de connaissance ou des connaissances relatives physique.

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“…The primary mechanism is illustrated in figure 2, in which the key region is the area of contact between points A and B in figure 2(b). Figure 2(a) recalls that rolling is equivalent to (at a given instant) rotation about the contact point P. The net velocity, v Q , at a point Q is ωPQ and is directed at right angles [8] to the line PQ. Hence, every point in the front (rear) of the wheel has some velocity component downward (upward) and forward (forward).…”

Section: The Physical Origin Of Rolling Frictionmentioning

confidence: 99%

Rolling as a frictional equilibration of translation and rotation

Sharma

Reid

1999

Eur. J. Phys.

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In this paper we discuss the role of static and kinetic friction in the dynamics of rolling motion. First, the role of kinetic friction in bringing about and maintaining an equilibration, called free rolling, between the translational and rotational motions of a rigid disc on a rigid surface is briefly discussed. We then extend the discussion to real wheels and provide a physical origin of rolling friction by introducing a new concept, quasi-rolling, to explain how pure rolling can exist even in the presence of some sliding. Our treatment is specifically applicable to rolling motion between two hard surfaces, such as ball- and roller-bearings.

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A new observation about rolling motion

Cited by 3 publications

References 2 publications

Rolling reloaded

Rolling reloaded

Using photographs to elicit student ideas about physics: The case of an unusual liquid-level phenomenon

Rolling as a frictional equilibration of translation and rotation

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