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In this paper, the dynamic case of a system made up of two blocks connectedby a string over a smooth pulley is revisited. One mass lies on a horizontalsurface without friction, and the other mass has a vertical displacement. Themotion equation is obtained and its solution is determined using theMathematica package. Also, an experimental montage for this system is made andexperimental data for the vertical position $y$ in function of the time $t$ areobtained using a Data Acquisition System and the Tracker video analysis. Therelation $y$ vs $t$ can be represented by a polynomial of degree six. Anaverage relative error of 3.61 (10.14) % is obtained between the theoreticalresults acquired with Mathematica and the data taken from the Tracker (DataAcquisition System).

Two blocks connected by a string with variable tension: A dynamic case