Moment of inertia: Development of rotational dynamics KIT for physics students

Abstract

Moment of inertia is one of the factors that influences the motion of an object on the rotation motion. This study aims to determine the magnitude of the moment of inertia based on the form by varying the mass and radius. Variations of form in this study is a solid cylinder and a cylinder with a thick leather plate. Obtaining a constant value for the cylinder with a thick plate skin is made by comparing the value of moment of inertia between the solid cylinder and the moment of inertia in the cylinder with the skin of a thick plate. The research was done by rolling the tubular object on the incline with the height of h and the angle of θ. The motion of the object is then recorded using a slow motion and high resolution camera to get a good image. Variable of height h and angle θ will affect the acceleration of motion of the object. The motion in the sloping path follows the law of equivalence of mechanical energy so that the energy at the initial condition at the height of h and vo = 0 will be equal to the final state at h = 0 and v = max. The experimental results show the moment of inertia for mass which is distinguished by 0.000156 average while the calculation result was 0.000152 so there was a difference of 5.32%. The result of moment of inertia for the different radius is 0.000507, while the calculation is 0.000506 so there is a difference of 3.46%. The error of the results of moment of inertia is relatively small, so it can be concluded that KIT rotational dynamics can be applied in learning.