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# ImpulseAction

An action that adds velocity to an prim.

## Discussion

Use this action to speed up, slow down, or throw a stationary prim.

### Declaration

```other
class Preliminary_Action "ImpulseAction"
```

## Topics

### Properties

[info:id](/documentation/USD/info-id)

The action’s unique identifier.

[affectedObjects](/documentation/USD/affectedobjects)

A list of prims that respond to the notification.

[velocity](/documentation/USD/velocity)

The amount of velocity the impulse adds to the target prims.


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