# GetReactionTorque(float)

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

## Definition

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

```csharp
public float GetReactionTorque(float timeStep)
```

### Parameters

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

### Returns

| Type                                                          | Description                                                   |
| ------------------------------------------------------------- | ------------------------------------------------------------- |
| [float](https://learn.microsoft.com/dotnet/api/system.single) | The reaction torque of the joint in the specified `timeStep`. |

### Remarks

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

Additional Resources: [\_reactionTorque](/engine/6000.7/script-reference/unityengine/joint2d/reactiontorque.md), [\_breakTorque](/engine/6000.7/script-reference/unityengine/joint2d/breaktorque.md)