Theorem of parallel axis o
Parallel Axis Theorem : The moment of inertia of a body about any axis is equal to the sum of the moment of inertia of the body about a parallel axis passing through its centre of mass and the product of its mass and the square of the distance between the two parallel axes .
o This theorem is applicable to a body of any shape .
Example : Given the moment of inertia of a disc of mass M and radius R about any of its diameters to be MR 2 / 4 , find its moment of inertia about an axis normal to the disc and passing through a point on its edge
Solution :