MODEL FOR DEMONSTRATIONS theorem of three FORCES

摘要

The invention relates to visual aids, and may find application in educational laboratories theoretical mechanics.; Known model to demonstrate the theorem of three forces, consisting of a frame with stand, transparent body, pivotally suspended from the upper part to the frame and composed of two halves connected together by threaded fastening members, between which the vectors acting on the body forces. Its main disadvantage is that the coupling reaction shown constantly, and they appear only when the body hanging in the frame.; The proposed model in the continuous body along the lines of action due reactions openings of cylindrical shape, in which the elements duralight are included in the electric circuit. At the time of the suspension to the body frame is connected to the electric circuit of the electric power source. Elements representing communications reactions begin to glow and highlight them on the dubbing of the film body sidewalls. This allows to demonstrate the appearance of communication at the time of reactions of the body to the suspension frame, and the disappearance of their time of withdrawal of the body from the suspension.