2014
DOI: 10.1590/s1806-11172014000100004
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O paradoxo cinemático de Galileu

Abstract: Descrevemos um aparato de baixo custo e apresentamos um vídeo curto que podem ser utilizados pelo professor em sala de aula para demonstrar e ilustrar um paradoxo cinemático aparente descrito por Galileu Galilei em uma carta para Guidobaldo del Monte e também em Duas Novas Ciências. A solução cinemática desse paradoxo aparente também é discutida.

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“…Galileoʼs kinematical paradox has an interesting consequence: if several bodies initially at rest are released simultaneously from the top of the circle, each one sliding along a different chord starting at A (like AB in figure 1), then at a given instant their positions will be on an expanding circle whose centre moves down with acceleration g 2. This was already discussed by Galileo in [2], and a more pedagogically oriented presentation can be found in [5,6].…”
Section: Introductionmentioning
confidence: 92%
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“…Galileoʼs kinematical paradox has an interesting consequence: if several bodies initially at rest are released simultaneously from the top of the circle, each one sliding along a different chord starting at A (like AB in figure 1), then at a given instant their positions will be on an expanding circle whose centre moves down with acceleration g 2. This was already discussed by Galileo in [2], and a more pedagogically oriented presentation can be found in [5,6].…”
Section: Introductionmentioning
confidence: 92%
“…It is easily shown (see [5]) that equations (5) and (6) which represents a circle with time-dependent radius given by…”
Section: Galileoʼs Kinematical Paradox: a Brief Reviewmentioning
confidence: 99%
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