# tangentSpeed

> The tangent (surface) speed. This is assigned to the current _surfaceMaterial.

## Definition

* **Type:** Property
* **Namespace:** [Unity.U2D.Physics](/engine/6000.5/script-reference/unity/u2d/physics.md)
* **Assembly:** UnityEngine.PhysicsCore2DModule

```csharp
public float tangentSpeed { get; set; }
```