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Mechanics

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Full-Text Articles in Physics

Applying A Resources Framework To Analysis Of The Force And Motion Conceptual Evaluation, Trevor I. Smith, Michael C. Wittmann Oct 2017

Applying A Resources Framework To Analysis Of The Force And Motion Conceptual Evaluation, Trevor I. Smith, Michael C. Wittmann

Trevor I. Smith

We suggest one redefinition of common clusters of questions used to analyze student responses on the Force and Motion Conceptual Evaluation. Our goal is to propose a methodology that moves beyond an analysis of student learning defined by correct responses, either on the overall test or on clusters of questions defined solely by content. We use the resources framework theory of learning to define clusters within this experimental test that was designed without the resources framework in mind. We take special note of the contextual and representational dependence of questions with seemingly similar physics content. We analyze clusters in ways ...


Comparing Three Methods For Teaching Newton’S Third Law, Trevor I. Smith, Michael C. Wittmann Oct 2017

Comparing Three Methods For Teaching Newton’S Third Law, Trevor I. Smith, Michael C. Wittmann

Trevor I. Smith

Although guided-inquiry methods for teaching introductory physics have been individually shown to be more effective at improving conceptual understanding than traditional lecture-style instruction, researchers in physics education have not studied differences among reform-based curricula in much detail. Several researchers have developed University of Washington–style tutorial materials, but the different curricula have not been compared against each other. Our study examines three tutorials designed to improve student understanding of Newton’s third law: the University of Washington’s Tutorials in Introductory Physics (TIP), the University of Maryland’s Activity-Based Tutorials (ABT), and the Open Source Tutorials (OST) also developed at ...


Viscoelastic Properties Of A Bent And Straight Dimeric Liquid Crystal, Gregory A. Dilisi, Charles Rosenblatt, Anselm C. Griffin, Eugene M. Terentjev Apr 1993

Viscoelastic Properties Of A Bent And Straight Dimeric Liquid Crystal, Gregory A. Dilisi, Charles Rosenblatt, Anselm C. Griffin, Eugene M. Terentjev

Gregory A. DiLisi

Absolute values for the elastic constants and viscosities are reported in the nematic phase for two dimers based upon the monomer 4.4'-dipentyloxyphenylbenzoate. One dimer has an even number of methylene units in the spacer and, in consequence, is approximately straight in the all-trans conformation. The other dimer has one less methylene unit, and is therefore bent. We find that the ratio K33/K11 for the odd dimer is reduced relative to that for the even member of the series. Moreover, we find that the absolute elastic constants for the odd dimer are of order one-half that of the ...


Bend Elastic-Modulus Of A Bent And Straight Dimeric Liquid-Crystal, Gregory A. Dilisi Apr 1992

Bend Elastic-Modulus Of A Bent And Straight Dimeric Liquid-Crystal, Gregory A. Dilisi

Gregory A. DiLisi

Light scattering measurements in the nematic phase are reported for two dimers based upon the monomer 4,4'-dipentyloxyphenylbenzoate. One dimer has an even number of methylene units in the spacer and, in consequence, is approximately straight in the all-trans conformation. The other dimer has one less methylene unit in the spacer and is, therefore, bent at the spacer group. We find that the ratio of the twist to splay elastic modulus is nearly the same for both species, but that the ratio of the bend to splay modulus is considerably smaller in the bent dimer.