# Impulse

> Add an instant force impulse to the rigidbody2D, using its mass.

## Definition

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

```csharp
Impulse = 1
```

### Remarks

Apply the impulse force instantly. This mode depends on the mass of rigidbody so more force must be applied to move higher-mass objects the same amount as lower-mass objects.

This mode is useful for applying forces that happen instantly, such as forces from explosions or collisions.