Instrumento livre para medidas de movimento

Translated title of the contribution: Free instrument for measurements of motion

Norberto Peña, Bruno Cecílio Credidio, Lorena Peixoto Nogueira Rodriguez Martinez Salles Corrêa, Lucas Gabriel Souza França, Marcelo do Vale Cunha, Marcos Cavalcanti de Sousa, João Paulo Bomfim Cruz Vieira, José Garcia Vivas Miranda*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

14 Citations (Scopus)


This paper presents the validation of a computational tool that serves to obtain continuous measurements of moving objects. The software uses techniques of computer vision, pattern recognition and optical ow, to enable the tracking of objects in videos, generating data trajectory, velocity, acceleration and angular movement. The program was applied to track a ball around a simple pendulum. The methodology used for this validation takes as a basis for comparisons the measured values of the program as well as the theoretical values expected according to the model of a simple pendulum. The experiment is appropriate to the method because it was built within the limits of the linear harmonic oscillator, and energy losses due to friction had been minimized, making it the most ideal possible. The results indicate that the tool is sensitive and accurate. Deviations of less than a millimeter in the measurements of the trajectory ensure the applicability of the software on physics, either in research or in teaching topics.

Translated title of the contributionFree instrument for measurements of motion
Original languagePortuguese
Article number3505
JournalRevista Brasileira de Ensino de Fisica
Issue number3
Publication statusPublished - 2013
Externally publishedYes

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