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Traditionally in the physics laboratories of secondary educational school or university institutions simple Pendulum experiment is introduced to teach concepts such as time and simple harmonic motion. This experience usually requires to be carry out with the aid of stopwatches controlled by students or by using electronic laboratory equipment that quantifies the period autonomously. This work presents an alternative using computer vision, through a web camera as a tool for the analysis of Simple Pendulum for measurement and estimation of the magnitude of the gravitational field and the length of the weightless cord. The application developed calculates the results of measured period with a relative error less than 0,5%, which makes it a reliable tool to complement the work in class for institutions that do not have financial resources for having a reliable and easy simple tool to use. [ABSTRACT FROM AUTHOR]