Monday 10 September 2012

Parallel Axis Theorem and Perpendicular Axis Theorem


PARALLEL AND PERPENDICULAR AXIS THEOREMS

PARALLEL AXIS THEOREM
The Moment of Inertia of any plane area about any axis parallel to its centrodial axis is equal to summation of its moment of Inertia about centroidal axis and product of its area and square of distance between the two axes.

PERPENDICULAR AXIS THEOREM
Moment of Inertia of a plane area about any axis perpendicular to plane area is equal to sum of its moment of inertias about the two perpendicular axes lying in the plane of area. The perpendicular axis should pass through intersection point of axes lying in the plane of area.



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