Balance force demonstration device for high school physics experiment

The utility model discloses a balance force demonstration device for a high school physics experiment, which comprises a base, the upper surface of the base is fixedly connected with a supporting rod, the upper end of the supporting rod is rotatably connected with a fixing block through a rotating shaft, a fixing hole is formed in the fixing block in a penetrating manner, and the fixing hole is communicated with the supporting rod. The gear fixing device has the advantages that when the gear fixing device is used, the mounting rod can pull the clamping base downwards to descend and release limiting on the gear by pulling the mounting rod downwards, and at the moment, the position of the connecting rod can be adjusted by pulling the connecting rod; the mounting rod can be loosened after balance adjustment is completed, at the moment, the spring pushes the mounting rod upwards through the annular block, the mounting rod drives the clamping base to fix the gear again, the gear fixes the connecting rod through me