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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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## 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: -
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## What is the moment of inertia of a cylinder?

A: The moment of inertia of a solid cylinder is equal to one half of the mass multiplied by the square of the radius. This equation should be used to find the... Full Answer >Filed Under: -
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## What is the parallel axis theorem?

A: The parallel axis theorem states that the "moment of inertia of any object about an axis through its center of mass is the minimum moment of inertia for an... Full Answer >Filed Under: -
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## How do you calculate the moment of inertia of a rod?

A: Calculating the moment of inertia for a rod requires you to know the mass, length and location of the rotational axis. An estimation may be required with r... Full Answer >Filed Under: