---
title: collisionImpulse
framework: spritekit
role: symbol
role_heading: Instance Property
path: spritekit/skphysicscontact/collisionimpulse
---

# collisionImpulse

The impulse that specifies how hard these two bodies struck each other in Newton-seconds.

## Declaration

```swift
var collisionImpulse: CGFloat { get }
```

## See Also

### Inspecting the Contact Properties

- [bodyA](spritekit/skphysicscontact/bodya.md)
- [bodyB](spritekit/skphysicscontact/bodyb.md)
- [contactPoint](spritekit/skphysicscontact/contactpoint.md)
- [contactNormal](spritekit/skphysicscontact/contactnormal.md)