In this free practice, you will need to assemble the scale model of a crane. To do so, you have been given a hydraulic cylinder, pins, a platform, bags of cement and a crane car. You will need to analyze the torque exerted by the forces present in the arm of the crane in order to determine the force which must be exerted by the cylinder in order to keep the system in equilibrium. In this practice, it is possible to select the value of the load and the height to which it must be lifted.