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# ForceMode.velocity

A direct adjustment to a body’s linear or angular velocity, independent of its mass or inertia.

```
case velocity
```

## Discussion

The quantity that user sets via [`setForce(_:index:)`](/documentation/RealityKit/ForceEffectParameters/setForce(_:index:))
has the units of distance / time.
`velocity` mode causes a change in velocity independent of a body’s mass.

The quantity that user sets via [`setTorque(_:index:)`](/documentation/RealityKit/ForceEffectParameters/setTorque(_:index:))
has the units of 1 / time or radian / time.
`velocity` mode causes a change in angular velocity independent of a body’s mass or inertia.

---

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