What is the physical significance of moment of inertia?

Explanation

### Step-by-Step Solution

1. **Understanding Moment of Inertia**:
- Moment of inertia (I) is a measure of an object's resistance to changes in its rotational motion. It quantifies how difficult it is to rotate an object about a specific axis.

2. **Comparison with Mass**:
- Just as mass is a measure of an object's resistance to changes in its linear motion (translational motion), moment of inertia serves a similar purpose for rotational motion. The greater the moment of inertia, the more torque (rotational force) is required to change the object's rotational state.

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