  In this paper, the dynamic case of a system made up of two blocks connected
by a string over a smooth pulley is revisited. One mass lies on a horizontal
surface without friction, and the other mass has a vertical displacement. The
motion equation is obtained and its solution is determined using the
Mathematica package. Also, an experimental montage for this system is made and
experimental data for the vertical position $y$ in function of the time $t$ are
obtained using a Data Acquisition System and the Tracker video analysis. The
relation $y$ vs $t$ can be represented by a polynomial of degree six. An
average relative error of 3.61 (10.14) % is obtained between the theoretical
results acquired with Mathematica and the data taken from the Tracker (Data
Acquisition System).
