It's mass.
Answer #1:The Rotational Inertia of an object increases as the mass "increases" and thedistance of the mass from the center of rotation "decreases".=================================Answer #2:If Answer #1 were correct, then flywheels would be made as small as possible,and a marble would be harder to spin than a wagon wheel is.An object's rotational inertia (moment of inertia) increases in direct proportionto its mass, and increases in proportion to the square of the distance of themass from the center of rotation.
Inertia is the tendency of an object to resist changes in its motion. As inertia increases, the object becomes more resistant to changes in its state of motion, making it harder to accelerate or decelerate. Conversely, as inertia decreases, the object becomes easier to accelerate or decelerate due to less resistance to changes in motion.
Mass is a measure of the amount of matter in an object, while inertia is the tendency of an object to resist changes in its state of motion. Mass and inertia are directly related - objects with more mass have more inertia, making them harder to accelerate or decelerate. The greater an object's mass, the greater its resistance to changes in motion due to its inertia.
It means the object has resistance to being acted on by an unbalanced force and moved. Like when you push something heavy, it doesnt move very far due to inertia. Inertia increases as Mass increases.
The amount of matter in an object is called mass, and it is a measure of the inertia of an object. Mass is a fundamental property of an object that quantifies how much matter it contains, influencing its resistance to acceleration or change in motion.
Mass
The quantities which depend on the mass will also increase. Though the increase of the mass of any object is not so easy and it can't be explained without Special theory of Relativity. If the mass increases then the momentum, the kinetic energy, the potential energy and the moment of inertia will increase.
The moment of inertia increases when mass is distributed farther from the center of a rotating object because the mass is located at a greater distance from the axis of rotation. This results in a larger rotational inertia, making it harder to change the object's rotational motion.
The mass of the object and the velocity of the object.
"inertia"
The mass of an object determines its inertia. Inertia is the resistance of an object to changes in its motion, and objects with greater mass have greater inertia.
the mass of an object. The greater the mass of an object, the greater its inertia. Additionally, inertia also depends on the velocity of the object - the faster an object is moving, the greater its inertia.