# GetReactionForce(float)

> Gets the reaction force of the joint given the specified timeStep.

## Definition

* **Type:** Method
* **Namespace:** [UnityEngine](/engine/6000.7/script-reference/unityengine.md)
* **Assembly:** UnityEngine.Physics2DModule

```csharp
public Vector2 GetReactionForce(float timeStep)
```

### Parameters

**** (\[float]\(https\://learn.microsoft.com/dotnet/api/system.single)): The time to calculate the reaction force for.

### Returns

| Type                                                              | Description                                                  |
| ----------------------------------------------------------------- | ------------------------------------------------------------ |
| [Vector2](/engine/6000.7/script-reference/unityengine/vector2.md) | The reaction force of the joint in the specified `timeStep`. |

### Remarks

When a joint tries to constrain a Rigidbody2D it may need to apply a force to do so.  This is known as the reaction force.

Additional Resources: [\_reactionForce](/engine/6000.7/script-reference/unityengine/joint2d/reactionforce.md), [\_breakForce](/engine/6000.7/script-reference/unityengine/joint2d/breakforce.md)