Smartphone sensors and video analysis: two allies in the Physics laboratory battle field

Publicado en el blog de Martín Monteiro .
Léelo completo en su sitio: http://fisicamartin.blogspot.com/2019/12/smartphone-sensors-and-video-analysis.html

«Smartphone sensors and video analysis: two allies in the Physics laboratory battle field»
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M. Monteiro (1,2), C. Cabeza (2), C. Stari (3) and A. C. Marti (2)

Universidad ORT Uruguay, Cuareim 1451, Montevideo, Uruguay
Facultad de Ciencias, UdelaR, Iguá 4225, Montevideo, Uruguay
Facultad de Ingeniería, UdelaR, Av. Julio Herrera y Reissig 565, Montevideo, Uruguay

Abstract
Recently, two technologies: video analysis and mobile device sensors have considerable impacted Physics teaching. However, in general, these techniques are usually used separately. Here, we focus on a less-explored feature: the possibility of using supplementary video analysis and smartphone (or other mobile devices) sensors. First, we review some experiments reported in the literature using both tools. Next, we present an experiment specially suited to compare both resources and discuss in detail some typical results. We found that, as a rule, video analysis provides distances or angular variables, while sensors gives velocity or acceleration (either linear or angular). The numerical derivation of higher derivatives, i.e. acceleration, usually implies noisier results while the opposite process (the numerical integration of a temporal evolution) gives rise to the accumulation of error. In a classroom situation, the comparison between these two techniques offers an opportunity to discuss not only concepts related to the specific experiment but also with the experimental and numerical aspects including their pros and cons.

M. Monteiro, C. Cabeza, C. Stari and A. C. Marti
«Smartphone sensors and video analysis: two allies in the Physics laboratory battle field»
arXiv:1910.00072 [physics.ed-ph]