The rotational analogue of mass is called the:

1. Mass measures how hard it is to change an object's linear motion. 2. The rotational equivalent measures how hard it is to change its spin. 3. The quantity in question is called the rotational inertia or moment of inertia of a point mass a distance from the centre of rotation. 4. It plays the role of mass in the rotational form of Newton's second law. _Source: OpenStax College Physics for AP(R) Courses 2e (CC BY 4.0), Ch 10 'Rotational Motion and Angular Momentum', sections 10.1-10.7_