> ## Documentation Index
> Fetch the complete documentation index at: https://docs.ntop.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Edge Force

## About this Block

**What it does:** Applies a force vector to selected boundary edge entities. The force distributes over the nodes on the selected edge.

**Tips:**

* It only works with edge entities in boundary selection blocks. An error occurs if either nodes or faces are selected as the entity.
* The reference Frame defines the components of the Vector. This input is optional. Leaving it blank automatically applies the global coordinate system.
* Add a Vector or Vector Field block type to the Vector input.
  * Using a Vector Field allows you to use a varying magnitude.
  * The Vector is measured in force per unit length.
  * If you type in the Vector units as N/m they automatically convert to the standard block units.

## Example File

![Edge Force](https://storage.googleapis.com/files-learn/static/ExtendedBlockDocs/edge_force.png)

***

Applies a force vector to selected boundary edge entities. The force will be distributed over the nodes on the selected edge.

### Inputs

| Name     | Type                                                               | Description                                                                                                                            |
| -------- | ------------------------------------------------------------------ | -------------------------------------------------------------------------------------------------------------------------------------- |
| Boundary | [Boundary](../../../../block-documentation/types/boundary)         | The boundary edges to apply the load.                                                                                                  |
| Vector   | [Vector Field](../../../../block-documentation/types/vector-field) | The force vector per unit length.                                                                                                      |
| Frame    | [Frame](../../../../block-documentation/types/frame)               | The reference frame for the components of the Vector. If a Frame is not specified, the components are in the global coordinate system. |

### Outputs

| Type                                                                   |
| ---------------------------------------------------------------------- |
| [Boundary Force](../../../../block-documentation/types/boundary-force) |