The invention belongs to the field of kinetics study apparatuses of a vertical plane and particularly relates to a kinetics apparatus related to the study on circular motion. A weight tied to a thin cord circularly moves in the vertical plane, an experimental phenomenon is theoretically unacceptable, and the kinetics study apparatus of the vertical plane is provided to explain the experimental phenomenon and prove theoretical correctness. The apparatus comprising a vertical panel is characterized in that the vertical panel is fixedly connected with a suction plate used for sucking a permanent magnet, a magnetic post is further provided, one end of the magnetic post sucks to the suction plate, the thin cord is tied to the other end of the magnetic post, the upper end of the thin cord is tied to the magnetic post, the weight is hung to the lower end of the thin cord, the vertical panel is provided with a hole penetrating the front and back of the vertical panel, a first nozzle used for spraying flame to burn off the thin cord as soon as possible after the thin cord is off balance is disposed in the hole, and the flame is sprayed from the first nozzle in a direction perpendicular to both the vertical panel and the thin cord.