Digital video analysis of falling objects in air and liquid using Tracker

Sirisathitkul, Chitnarong; Glawtanong, P.; Eadkong, Thammarong; Sirisathitkul, Yaowarat

doi:10.1590/s1806-11172013000100020

Cited by 30 publications

(23 citation statements)

References 17 publications

(22 reference statements)

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“…Numerous investigations have been published on laboratory experiments in which digital cameras or webcams are used [3][4][5][6][7] , optical mice 8,9 and games consoles and their wireless devices which control the games [10][11][12][13][14] . Also the sensors of smartphones are beginning to be used to make precise measurements [15][16][17][18][19][20] .…”

Section: Introductionmentioning

confidence: 99%

Measurement of the magnetic field of small magnets with a smartphone: a very economical laboratory practice for introductory physics courses

et al. 2015

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In this work we propose an inexpensive laboratory practice for the laboratory of an introductory course of Physics for any grade of Sciences and Engineering, which was very well received by our students, where a smartphone (iOS, Android or Windows Phone is irrelevant) is used together with some mini magnets, similar to those that can be found in the door of our refrigerators, a 20 cm long school rule, a paper and a free application (app) for measuring the magnetic field using the magnetic fields sensor or magnetometer of the smartphone, which needs to be downloaded and installed. The apps we have used are: Magnetometer (iOS), Magnetometer Metal Detector and Physics Toolbox Magnetometer (Android). Nothing else is needed. Cost of this practice: 0 coins. The main purpose of the practice is that students determine the dependence of the component x of the magnetic field produced by different magnets (from the typical magnets that are decorated in refrigerators even with a ring magnet and spherical magnet). We have obtained that the dependency of the magnetic field with the distance is of the form x -3 , in total agreement with the theoretical analysis. The secondary objective is to apply the technique of least squares fit to obtain this exponent and the magnetic moment of the magnets, with theirs corresponding absolute error.

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Section: Introductionmentioning

confidence: 99%

Measurement of the magnetic field of small magnets with a smartphone: a very economical laboratory practice for introductory physics courses

et al. 2015

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“…Following the procedures in Sirisathitkul et al. (), we analyzed the video using Tracker software (https://physlets.org/tracker), determined when instantaneous falling velocity reached a constant value, and referred to that value as terminal velocity.…”

Section: Methodsmentioning

confidence: 99%

Variation in morphological traits affects dispersal and seedling emergence in dispersive diaspores of Geropogon hybridus

Chen

Giladi

2020

American J of Botany

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Premise Intraspecific variation in diaspore characteristics could affect various aspects of plant performance at the population, individual plant, and seed levels. We quantified variation in dispersal traits in a wind‐dispersed annual, Geropogon hybridus (Asteraceae), focusing on continuous morphological traits of dispersive diaspores and their relationships to dispersal ability and seedling emergence. Methods We measured the morphological traits, terminal velocity, and seedling emergence of 1140 seeds from 10 populations in two successive years. We assessed the variation in traits among three hierarchical levels of organization and between years, and quantified their effects on diaspore terminal velocity and seedling emergence. Results Diaspore morphological traits varied substantially at the population, plant, and diaspore levels. Variables of pappus geometry, especially pappus width and pappus opening angle, were consistent between years and were found to be the best predictors of diaspore terminal velocity and seedling emergence. There was a significant negative relationship between diaspore terminal velocity and seedling emergence. Conclusions The intraspecific variation in diaspore traits is sufficiently large to substantially allow a dispersal–dormancy trade‐off of individual diaspores. Our results support the hypothesis that traits of dispersive diaspores evolve in concert to select for increased dispersal potential, and provide an avenue to predict plant offspring performance through simply measured traits.

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“…De acordo com a experiência dos autores, que inclui o uso do Tracker em aulas de Física em disciplinas de graduação (Engenharia e Física), pós-graduação (mestrado profissional em Ensino) e ensino médio, a videoanálise constitui tecnologia de fácil aprendizado, tanto por parte de professores quanto estudantes, e que pode ser incorporada às aulas de Física após algumas horas de estudo e de contato com o programa. Além disso, é crescente o número de artigos em que são apresentadas novas metodologias e atividades experimentais mediadas por videoanálise, especialmente o Tracker, de modo que há uma comunidade em expansão a dar instrução e apoio às iniciativas de utilizar tal tecnologia em sala de aula (BROWN;COX, 2009;BRYAN, 2010;PHOMMARACH et al, 2012;BEZERRA et al, 2012;SIRISATHITKUL et al, 2013;WRASSE et al, 2014;SILVA;LIMA, 2017;BONATO et al, 2017;SILVA, 2018). Essa, certamente, é uma característica que favorece sua apropriação por parte dos professores e que torna viável seu emprego na sala de aula.…”

Section: Videoanálise E O Software Trackerunclassified

Videoanálise e Ensino de Física em Situação de Vulnerabilidade Social

Oliveira

Lenz

Filho

et al. 2019

Abakos

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O presente trabalho apresenta uma aplicação em sala de aula do software livre Tracker, que é destinado à vídeoanálise, ou análise de movimentos quadro a quadro. A utilização do programa tem como objetivo criar alternativas para a falta de um efetivo laboratório didático de Ciências, falta que é um problema real em várias escolas brasileiras. Com a videoanálise, é possível abordar conceitos de Física por meio de filmagens feitas com câmeras digitais, inclusive aquelas presentes em telefones celulares. Os filmes podem ser gravados e analisados com o próprio Tracker ou com auxílio de um programa de planilhas eletrônicas. A proposta foi aplicada em turmas do 1.º ano do Ensino Médio em uma escola pública da rede estadual, que atende alunos de uma região carente e com grande risco social. A avaliação do trabalho foi realizada por meio de um relatório contendo questões sobre queda livre, comparando situações em que o programa foi usado com outras em que não foi. O material utilizado propôs aos alunos uma dinâmica motivadora para aprender e aplicar seus conhecimentos. Além disso, as aulas serviram de estímulo aos estudantes para um uso inclusivo e crítico de recursos tecnológicos.

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Digital video analysis of falling objects in air and liquid using Tracker

Cited by 30 publications

References 17 publications

Measurement of the magnetic field of small magnets with a smartphone: a very economical laboratory practice for introductory physics courses

Measurement of the magnetic field of small magnets with a smartphone: a very economical laboratory practice for introductory physics courses

Variation in morphological traits affects dispersal and seedling emergence in dispersive diaspores of Geropogon hybridus

Videoanálise e Ensino de Física em Situação de Vulnerabilidade Social

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