# reactionForce

> Gets the reaction force of the joint.

## Definition

* **Type:** Property
* **Namespace:** [UnityEngine](/engine/6000.0/script-reference/unityengine.md)
* **Assembly:** UnityEngine.Physics2DModule

```csharp
public Vector2 reactionForce { get; }
```

### 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: [Joint2D.GetReactionForce](/engine/6000.0/script-reference/unityengine/joint2d/getreactionforce.md), [Joint2D.breakForce](/engine/6000.0/script-reference/unityengine/joint2d/breakforce.md).