Last Updated on April 8, 2025 by Maged kamel
Video for Parallel axes theory for the moment of inertia.
An introduction to the parallel axes theorem. The video explains how we can find the expressions for the moment of inertia about an external Y axis equal to the moment of inertia about the CG plus the product of the area times the square distance from the CG to that external axis.
Similarly, the product of the area about two external axes equals the product of the area at the CG plus the area by the x distance times the y distance from the CG to these axes. The polar moment of inertia at the intersection of any two axes is equal to the polar moment of area at the same point for any other two orthogonal axes passing at the same point.
The first video is a 1-video for introducing the moment of inertia.
The related post is Post 2-Parallel axes theorem for Iy, polar moment of inertia.
A newly added video, 3-Video for Ix for a rectangular section.