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¡Cuando la tostada resbala de la mano!

Author(s): Adrián Corona Cruz | Guillermo Martínez Peña

Journal: Latin-American Journal of Physics Education
ISSN 1870-9095

Volume: 2;
Issue: 3;
Start page: 331;
Date: 2008;
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Keywords: Murphy | teaching | angular speed | laboratory of physics | simulation.

The behavior of the toast falling from a hand is used for studying the dynamics of the rotational systems. The systemhas already been studied, considering the slip of the toast of the right-angled edge of a table. However, this situation isno very likely in real life. If the toasts fall, it is more likely they will fall from a hand. It is natural to model the edge ofa hand as being round. The experimental values of the maximum angular speed that acquires the toast in falling ofround edges turned out to be bigger than those in the case of the falls of a right-angled edge. We study the effect of theroundness in the angular speed of a parallelepiped (table) that simulates a toast when falling from the round edge of asurface. The table is made fall to different salient with the objective of determining the effect that has the initialposition in the angle that the table arrives to the floor. The angular speed of rotation of the table was determined fromthe sequence of the images of its video. To know the effect of the roundness of the edge, three radios they wereidentified: the first one refers to a right-angled edge; the second to a round edge (R=1.1 cm) that simulates the edge ofthe palm of a hand; and the third (R=1.75 cm) that simulates the edge of a table. The experimental results are describedwell by the numeric solution (simulation by the software Interactive Physics, IP), a model that makes simple to predictthe different behaviors and to evaluate the effect of the physical parameters involved in the dynamics of the system.
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