Experimental measurement device for rotational inertia

An experimental measurement device for a rotational inertia is disclosed, which belongs to the field of physical experimental device. The experimental measurement device for rotational inertia comprises a rotational inertia instrument (1), a pulley (6), a weight (7) and a nylon wire (10), wherein one end of the nylon wire (10) passes by the pulley (6) and is connected with the rotational inertia instrument (1), and the other end of the nylon wire (10) is connected with the weight (7). The experimental measurement device for rotational inertia is characterized in that a light-shielding sheet (3) is disposed on the nylon wire (10); the light-shielding sheet (3) is disposed in a light-shielding sheet rail (4); length scales are disposed on the surface of the light-shielding sheet rail (4), and photoelectric doors (2) are installed at the both ends of the light-shielding sheet rail (4); and the photoelectric doors (2) are connected with a digital millisecond meter (5) via photoelectric door connecting wires (9).