Use the checkboxes at the upper right to choose the situation you want to simulate. Use the other checkboxes to select the type (mass distribution) of circular object. Use the sliders to adjust the radius and mass of the circular object. Use the other sliders to adjust either the amount of force applied at the object's rim, the mass of the falling mass, or the masses of the two hanging masses (depending on the Simulation Type you have chosen). Press the Start button to begin the animation. Soon the amount of torque acting, the rotating object's angular acceleration, and the linear acceleration will be shown. Press the Pause button to pause the animation and the Reset button to reset the animation.