The following equation is used to calculate the shear force that is acting on a system or object.

## Shear Stress Definition

Shear stress is defined as the total stress seen acting co-planar to a materials cross section. Imagine two plate that are glued together. A equal and opposite forces are acting on each sheet, which is attempting to force the sheets apart. The stress seen between that glued piece is known as the shear stress.

## How to Calculate Shear Stress?

The following step by step problem is an example of calculating the shear stress on an object.

- First determine the total shear force acting on the object. For this example we will say after experimental measurements we find the shear force to be 25 N.
- Next, determine the first moment of area. We will assume this to be 30 m^3.
- Next, determine the moment of inertia of the piece of material. Formulas for this can be found online easily for common objects. We find it to be 10 m^4.
- Next, measure the overall thickness. It’s determined to be 1m.
- Finally, calculate the shear stress using the formula. (25*30/10*1) = 75 N/m^2

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