Q.2: Can a body with less mass have a greater moment of inertia than a body with more mass?Īns: The moment of inertia depends on the mass distribution and axis with respect to which we are calculating the moment of inertia therefore, it is possible to have a larger mass that can have less moment of inertia than a body with a lower mass. The effect or the effectiveness of the mass or inertia about a point or axis is known as the moment of inertia. For example, the effect of force on a point or axis is known as the moment of force or torque. Q.1: What is meant by the moment of a quantity?Īns: The moment of a physical quantity can be defined as the effectiveness of the particular quantity with respect to a point or axis. Moment of inertia about an axis which is at the distance of \(‘\) FAQs on Moment of Inertia The parallel axis theorem helps us to determine the moment of inertia easily about an axis passing through a point other than the centre of mass. It is to be noted that the moment of inertia depends on the distribution of mass around the axes thus, the figure with similar distribution has a similar expression for the moment of inertia. Rigid bodies are non-deformable thus, the distance between any two constituent particles always remain the same that is, if we mark any two points on the rigid body, then regardless of the orientation of the rigid body, the separation between the two points will not change. A Rigid body can be considered to be a collection of infinite numbers of particles. Instead, we deal with continuous bodies which have some volume and occupy space. In practical scenarios, most of the time, we do not deal with particles. The moment of inertia depends on the mass distribution and axis with respect to which we are calculating the moment of inertia a body having a larger mass can have less moment of inertia than a body with a lower mass.
The role of the moment of inertia in rotational motion is analogous to the role played by the mass in translational motion.
In practical scenarios, we deal with both translation and rotational motion. The moment of inertia means the moment of mass with respect to an axis. Study Inertia And Its Types Here What is the Moment of Inertia Formula?
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