MODULUS OF ELASTICITY: The ratio of stress to strain or the stiffness of the material of a structural member (resistance to deformation). Essentially, the modulus of elasticity is a more general term regarding the overall stiffness of a member. E= Modulus of Elasticity. If E increases, then the stiffness increases. MOMENT OF INERTIA: There are two types of moment of inertia; mass moment of inertia and area moment of inertia. The moment of inertia of a Mass (I) Defined as the sum of the products of the mass (m) of each particle of the body the square of its perpendicular distance (r) from the axis is mathematically represented as I = mr² The mass distribution of a body of rotating particles from the axis of rotation is represented by the moment of inertia. The value of the moment of inertia is independent of the forces involved and depends only on the body geometry and position from the axis of rotation. The mass moment of inertia for rotation is analogous to ma...