Macrofotografia com um tablet: aplicações ao ensino de ciências

Vieira, L.P.; Lara, V.O.M.

doi:10.1590/s1806-11172013000300022

Cited by 4 publications

(2 citation statements)

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“…Alguns trabalhos, tais como [5][6][7], já demonstraram a gama de aplicativos que tais dispositivos apresentam e que podem ser explorados para fins didáticos. Em particular naárea da física, muitas leis podem ser confirmadas e visualizadas, o que torna alguns conceitos físicos mais concretos e palatáveis.…”

Section: Introductionunclassified

Ondas sonoras estacionárias em um tubo: análise de problemas e sugestões

Vieira

Amara²,

Lara

2014

Rev. Bras. Ensino Fís.

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No presente trabalho temos como objetivo apresentar alguns questionamentos com respeito à abordagem utilizada em alguns livros didáticos de nível médio sobre o tema de ondas sonoras estacionárias em tubos. Além de classificar os livros didáticos dentro de um conjunto de critérios estabelecidos, apresentamos também algumas sugestões para uma discussão mais aprofundada deste tema. Sugerimos o uso de gifs e animações e a utilização de dois experimentos simples, que permitem a visualização dos perfis de variação de pressão e deslocamento de ar para os modos harmônicos de vibração.

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Section: Introductionunclassified

Ondas sonoras estacionárias em um tubo: análise de problemas e sugestões

Vieira

Amara²,

Lara

2014

Rev. Bras. Ensino Fís.

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“…The use of tablets and smartphones in science education expands the possibilities of approaches that motivate students to better understand several physical phenomena [1][2][3][4]. In particular, tablets have been shown to be good tools for measuring the magnetostatic responses in current-carrying wires.…”

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Demonstrations of magnetic phenomena: measuring the air permeability using tablets

Lara

Amaral²,

Faria

et al. 2014

Phys. Educ.

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We use a tablet to determine experimentally the dependencies of the magnetic field (B) on the electrical current and on the axial distance from a coil (z). Our data shows a good precision on the inverse cubic dependence of the magnetic field on the axial distance, B ∝ z −3 . We obtain with good accuracy the value of air permeability µair. We also observe the same dependence of B on z when considering a magnet instead of a coil. Although our estimates are obtained through simple data fits, we also perform a more sophisticated error analysis, confirming the result for µair. PACS numbers:The use of tablets and smartphone in science education expands possibilities for approaches that motivate students to understand better several physical phenomena [1][2][3][4]. In particular, tablets were shown as good tools to measure magnetostatic responses in current-carrying wires. This interesting work is about magnetic field sensoring [1]. It reports a simple way of obtaining experimentally the linear dependence between the magnetic field B and the number of turns N in the current-carrying coil using an "app" for iPad [5]. However, additional dependences of B are still not discussed, some of which we show in this paper leading to a wider description of this kind of system.We determine the dependencies of B on the electric current I and on the axial distance z in a coil, in suitably conditions using an iPad and the same free app MagnetMeter [5] (we suggest a similar app for Android [6]). We also perform the similar experiments with a small magnet instead of a coil. For the coil, we also make a good estimate for the magnetic permeability of the air µ air ∼ = µ 0 ≡ 4π × 10 −6 Hm −1 . The demonstration set used is composed by an electrical circuit, a ruler and a book. The circuit is formed by the following components, all of them connected in series: a wirewound potentiometer with resistance up to 30Ω; a resistor with 10Ω; an electrical source from a cell phone (max. output current ∼ 0.9A); a digital multimeter and a coil (internal diameter 2R i = 1.91 cm and external diameter 2R e = 2.42 cm and N = 62 turns).

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