---
title: friction
framework: spritekit
role: symbol
role_heading: Instance Property
path: spritekit/skphysicsbody/friction
---

# friction

The roughness of the surface of the physics body.

## Declaration

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

## Discussion

Discussion This property is used to apply a frictional force to physics bodies in contact with this physics body. The property must be a value between 0.0 and 1.0. The default value is 0.2.

## See Also

### Defining a Physics Body’s Physical Properties

- [Configuring a Physics Body](spritekit/configuring-a-physics-body.md)
- [mass](spritekit/skphysicsbody/mass.md)
- [density](spritekit/skphysicsbody/density.md)
- [area](spritekit/skphysicsbody/area.md)
- [restitution](spritekit/skphysicsbody/restitution.md)
- [linearDamping](spritekit/skphysicsbody/lineardamping.md)
- [angularDamping](spritekit/skphysicsbody/angulardamping.md)