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# What is a bending moment?

**The bending moment is the point at which an element, such as a beam, is acted upon by external forces on one side and bends.** The bending moment and shearing force of a beam are important factors to consider in the construction of buildings.

To properly support a beam, the bending moment must balance against the internal load capacity of the beam. A complex equation is used to determine the bending moment and shearing force of a beam that allow the beam to be properly supported. A positive bending moment makes the beam concave in an upward direction, while a negative bending moment bends the beam downward.

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Q:
## What are the units for moment of inertia?

A: The SI units for moment of inertia are kg m^2. For a point mass, the moment of inertia equals mass times radius squared, so other mass units (such as pound... Full Answer >Filed Under: -
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## Why does a ring have a higher moment of inertia than a solid disc of equal mass and outer radius?

A: Northwestern University explains that a ring has a higher moment of inertia than a solid disk of equal mass and outer radius because it has less mass at it... Full Answer >Filed Under: -
Q:
## How do you calculate angular momentum?

A: As explained by Hyperphysics, angular momentum is calculated by finding the product of the moment of inertia and the angular velocity of a rotating body or... Full Answer >Filed Under: -
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## What is the moment of inertia of a sphere?

A: The moment of inertia of a sphere is I = 2/5 MR^2 for a solid sphere and I = 2/3 MR^2 for a thin spherical shell. This moment of inertia can be derived fro... Full Answer >Filed Under: