Uncertainty analysis on measuring rotational inertia of rigid body with tri-linear pendulum method

The rotational inertia of the circle is measured by the tri-linear pendulum method,the theoretical value and experimental value of the rotational inertia of the circle are given,and results of the experiment are analyzed according to the uncertainty.The relative deviation is about 3% using the tri-linear pendulum method,the experimental deviation can be accurately evaluated by the uncertainty.It is beneficial for the engineers and technieians to master and understand the uncertainty,moreover,it is helpful to link to the science researcher and the physical experiment teaching.