---
title: "changeMass(to:duration:)"
framework: spritekit
role: symbol
role_heading: Type Method
path: "spritekit/skaction/changemass(to:duration:)"
---

# changeMass(to:duration:)

Creates an action that changes the mass of a node’s physics body to a new value.

## Declaration

```swift
class func changeMass(to v: Float, duration: TimeInterval) -> SKAction
```

## Parameters

- `v`: The new mass of the physics body.
- `duration`: The duration of the animation.

## Return Value

Return Value A new action object.

## Discussion

Discussion When the action executes, the physics body’s mass property animates from its current value to its new value. This action is not reversible.

## See Also

### Animating Properties of a Node’s Physics Body

- [applyForce(_:duration:)](spritekit/skaction/applyforce(_:duration:).md)
- [applyTorque(_:duration:)](spritekit/skaction/applytorque(_:duration:).md)
- [applyForce(_:at:duration:)](spritekit/skaction/applyforce(_:at:duration:).md)
- [applyImpulse(_:duration:)](spritekit/skaction/applyimpulse(_:duration:).md)
- [applyAngularImpulse(_:duration:)](spritekit/skaction/applyangularimpulse(_:duration:).md)
- [applyImpulse(_:at:duration:)](spritekit/skaction/applyimpulse(_:at:duration:).md)
- [applyImpulse(_:duration:)](spritekit/skaction/applyimpulse(_:duration:).md)
- [changeCharge(to:duration:)](spritekit/skaction/changecharge(to:duration:).md)
- [changeCharge(by:duration:)](spritekit/skaction/changecharge(by:duration:).md)
- [changeMass(by:duration:)](spritekit/skaction/changemass(by:duration:).md)
- [strength(to:duration:)](spritekit/skaction/strength(to:duration:).md)
- [strength(by:duration:)](spritekit/skaction/strength(by:duration:).md)
- [falloff(to:duration:)](spritekit/skaction/falloff(to:duration:).md)
- [falloff(by:duration:)](spritekit/skaction/falloff(by:duration:).md)