Uniform circular motion experimental device

The utility model discloses a uniform circular motion experimental device. A turntable (1) is provided with a protruding center shaft (5), one end of a sliding rail (3) is fixed with the center shaft (5), and the other end is fixed on a bracket (7); the sliding rail (3) is symmetrically provided with springs (6) and small balls (2), one end of each spring (6) is connected with the center shaft (5), and the other end is connected with each small ball (2); the turntable (1) is marked with a graduated scale (4) for recording positions of the center of small ball; and the turntable (1) is driven to rotate by a speed reducing motor, and the rotation speed of the turntable (1) is controlled by a speed regulator, therefore, the correctness of an expression of centripetal forces.