Acting force and reacting force demonstrator for teaching

The invention relates to the field of teaching appliances, in particular to an acting force and reacting force demonstrator for teaching. The demonstrator comprises a pedestal, a disc base, a rotatingdisc, a workbench, a supporting rotating frame, a bearing, a controller, a transverse tension mechanism and a longitudinal tension mechanism; the supporting rotating frame is arranged on the disc base; the transverse tension mechanism comprises a frequency modulation motor, a sliding table, a movable sliding block, a threaded rod, a first spring dynamometer, a second spring dynamometer and a third spring dynamometer; the longitudinal tension mechanism comprises a fourth spring dynamometer, a limiting sliding block, a supporting frame and an electric push rod; and the supporting frame is of aU-shaped structure and is fixedly arranged at the top of the limiting sliding block. According to the acting force and reacting force demonstrator for teaching in the invention, the first spring dynamometer is in butt joint wi