The moment Inertia

1. The moment inertia - it is an object resistance to change its rotation.

2. The SI unit : Kgm² (mass x length² )

3.Factor that effect the moment of inertia :
a. The mass of the body / object.
b.The distribution of the mass throughout the body.Hence,two body with the same mass may possess different moment of inertia.See figure 1 and 2

Figure 1 : Drivers reducing their moments of inertia  to increase their rate of rotation.

Figure 2 : Noted that,the angular velocity ( the movement / speed of body in rotaional shape ) increases as the distance from the central axis being reduced.