---
title: impulse
framework: realitykit
role: symbol
role_heading: Instance Property
path: realitykit/collisionevents/began/impulse
---

# impulse

The total impulse in this collision pair obtained by adding up all the individual impulses applied at each contact point.

## Declaration

```swift
let impulse: Float
```

## See Also

### Characterizing the collision

- [position](realitykit/collisionevents/began/position.md)