What concept measures the reluctance of an object to change its rotational state?

What concept measures the reluctance of an object to change its rotational state?

• A. Rotational inertia
• B. Centripetal force
• C. Kinetic energy
• D. Torque

Answer: (A)

The concept that measures the reluctance of an object to change its rotational state is known as rotational inertia, also commonly referred to as moment of inertia. This property quantifies how difficult it is to change the rotational motion of an object about a specified axis. Rotational inertia depends on both the mass of the object and how that mass is distributed relative to the axis of rotation. An object with a large moment of inertia will resist changes to its rotational velocity more than an object with a small moment of inertia. For instance, a solid disc rotating around its center has a different rotational inertia compared to a ring of the same mass rotating around the same axis. In contrast, centripetal force refers to the net force acting on an object moving in a circular path, and is not a measure of reluctance to change rotation. Kinetic energy represents the energy of an object due to its linear motion and does not directly concern rotational dynamics. Torque, while related to rotational motion, is the measure of the force that would cause an object to rotate about an axis and rather indicates the capability to change rotational state rather than the resistance to that change. Thus, when considering the reluctance to change an object’s rotational state, rotational inertia is the relevant concept

The concept that measures the reluctance of an object to change its rotational state is known as rotational inertia, also commonly referred to as moment of inertia. This property quantifies how difficult it is to change the rotational motion of an object about a specified axis.

Rotational inertia depends on both the mass of the object and how that mass is distributed relative to the axis of rotation. An object with a large moment of inertia will resist changes to its rotational velocity more than an object with a small moment of inertia. For instance, a solid disc rotating around its center has a different rotational inertia compared to a ring of the same mass rotating around the same axis.

In contrast, centripetal force refers to the net force acting on an object moving in a circular path, and is not a measure of reluctance to change rotation. Kinetic energy represents the energy of an object due to its linear motion and does not directly concern rotational dynamics. Torque, while related to rotational motion, is the measure of the force that would cause an object to rotate about an axis and rather indicates the capability to change rotational state rather than the resistance to that change. Thus, when considering the reluctance to change an object’s rotational state, rotational inertia is the relevant concept