---
title: xAcceleration
framework: spritekit
role: symbol
role_heading: Instance Property
path: spritekit/skemitternode/xacceleration
---

# xAcceleration

The acceleration to apply to a particle’s horizontal velocity.

## Declaration

```swift
var xAcceleration: CGFloat { get set }
```

## Discussion

Discussion This property is useful for simulating wind, gravity and other effects. It is uniformly applied to all particles generated by the emitter. The default value is 0.0.

## See Also

### Controlling Particle Velocity and Acceleration

- [particleSpeed](spritekit/skemitternode/particlespeed.md)
- [particleSpeedRange](spritekit/skemitternode/particlespeedrange.md)
- [emissionAngle](spritekit/skemitternode/emissionangle.md)
- [emissionAngleRange](spritekit/skemitternode/emissionanglerange.md)
- [yAcceleration](spritekit/skemitternode/yacceleration.md)
- [particleZPositionSpeed](spritekit/skemitternode/particlezpositionspeed.md)