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Unformatted text preview: Set up for Part B Part B in action Set up for Part D Part D in action ABSTRACT This experiment deals with the determination of moment of inertia of disk and a ring including the factors affecting it to vary. Setting up the apparatus was initially done followed by the experiment proper. The moment of inertia, or the ability to rotate a certain body, of the two objects in combination and the disk alone, is then done simultaneously. The object is allowed to rotate about its axis with the aid of mass loads which serves as the tension causing it to rotate. The I of a ring is obtained from the difference of the total I and the I disk . Afterwards, the I of a disk is computed again but this time, it is rotated about its diameter. The method used for this experiment is the application of Newtons second law and integration with respect to the change in volume. Results shows that the difference in density of an object and difference in orientation of rotation are the factors why moment of inertia either increase or decrease. INTRODUCTION On some diving show, we always see rhythmic patterns of falling of the divers into the water. We observe that they moving up their feet and bend. It is their way of increasing their rates of rotation. For this experiment, we are to discuss another realm of physics, which is moment of inertia. Certain rigid bodies, like a bending human, have a resisting force to rotate it and its magnitude depends on the shape, size and the distance of rotation from the force applied. This is known to be the moment of inertia. The moment of inertia of a given body describes how hard is to change its angular motion about a given axis. It does not only deal with mass of the object itself but also how far this mass from the axis on the overall. For this particular experiment, mass moment of inertia of a ring and a disk was obtained. Moment of inertia, I , of an object with definite shape can be expressed in terms of radius (vector quantity) and a constant mass (scalar quantity). For a point mass, like a very small rock tied to a string, the moment of inertia is = I mr2 equation 1 where m is the mass of the object and r is the distance from the mass to the center of rotation. Ifseveral masses rotate about an axis, like a cheerleader's baton, the net moment of inertia is simply the sum of the individual moments....
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