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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: -
Q:
## What is a moment arm in physics?

A: A moment arm is the distance between the joint axis and the line of force acting on the joint; an example is using a wrench to loosen a nut, the wrench act... 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 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: