Moment of Inertia
- The moment of inertia about any point or axis is the product of the area and the perpendicular distance between the point or axis to the centre of gravity of the area. This is called the first moment of area.
- If this first moment of area is again multiplied by the perpendicular distance between them, the product is known as second moment of area.
- In case of a rigid body, its mass is considered and it is called second moment of mass.
- Second moment of area = Moment of Inertia
- Second moment of mass = Mass Moment of Inertia
- Denoted by MI or MOI.
MOI of Plane Area