Material didático para o ensino da física: ondas estascionárias em uma corda

Abstract

This work proposes to develop a didactic material for the teaching of physics for high school of the experimental and quantitative type. In order to contribute to the teaching of waves, a material was developed using a vibrator that oscillates with a frequency of 60 Hz, generating pulses that propagate in a stretched rope, with a point fixed in the other side. The string is the medium in which the pulse will be propagated, forming a harmonic pattern that can be measured, observed and modified. The modification of the harmonics occurs by changing the applied masses at the end of the string, changing the tension and the linear density of the string. In this way, we calculate the speed of the pulse and how it behaves when we change the values of the masses. In addition to the calculations, physical phenomena are observed, why this type of wave is called standing waves and also show that this discipline can be worked in a differentiated way relating the theory to the experimental practice. According to Halliday and Resnick, "If two sine waves of the same amplitude and even wavelength propagate in opposite directions on a string, mutual interference produces a stationary wave." Halliday, D.Resnick(2012.P135).