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The Physics Teacher -- September 2011 -- Volume 49, Issue 6, pp. 383

Experiments Using Cell Phones in Physics Classroom Education: The Computer-Aided g Determination

Patrik Vogt, Jochen Kuhn, and Sebastian Müller

University of Koblenz-Landau, Germany

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This paper continues the collection of experiments that describe the use of cell phones as experimental tools in physics classroom education.1–4 We describe a computer-aided determination of the free-fall acceleration g using the acoustical Doppler effect. The Doppler shift is a function of the speed of the source. Since a free-falling objects speed is changing linearly with time, the Doppler shift is also changing with time. It is possible to measure this shift using software that is both easy to use and readily available. Students will use the time-dependency of the Doppler shift to experimentally determine the acceleration due to gravity by using a cell phone as a freely falling object emitting a sound with constant frequency.

© 2011 American Association of Physics Teachers

Article Outline

  1. Theoretical information and experimental setup
  2. Measurement example

KEYWORDS and PACS

Keywords

acceleration, acoustic wave propagation, classical mechanics, computer aided instruction, Doppler effect, physics education, student experiments

PACS

  • 01.50.Lc

    Laboratory computer use

  • 01.50.Pa

    Laboratory experiments and apparatus

  • 45.20.da

    Forces and torques

  • 43.28.Py

    Interaction of fluid motion and sound, Doppler effect, and sound in flow ducts

PUBLICATION DATA

ISSN

0031-921X (print)  

Publisher

$abstract.society.value is a Member of CrossRef American Association of Physics Teachers

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1119/1.3628272

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