A device for continuous measurement of the forces acting upon a movable compressible playable object is provided with at least one transmitter communicating with at least one receiver outside the movable object. The at least one receiver transforms signals received and evaluates them online. The movable compressible playable object, for instance a ball, includes at least one pressure sensor and/or at least one three-dimensional acceleration sensor as well as a converter for transforming signals therefrom to transmit them to the transmitter. A method for the use of this device causes activation of the transmitter in the movable object so that a system is created for the measurement of the forces acting upon such an object wherein the received measuring signals are present in evaluated form, online or offline, to be analyzed. By means of the activation method, the active sensor system is initiated to receive and transmit measuring signals.