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The moment of inertia of a material is directly proportional to its mass and the distance of the particles of the material from the axis of rotation also Moment of inertia depends on the shape and size of the material. But there is no role of force and density to affect the moment of inertia of a body. A big or heavy object will have a high moment of inertia and be hard to rotate, and smaller awkwardly or uneven shaped objects can also have high moments of inertia and can be just as hard to rotate.