---
title: ForceMode.force
framework: realitykit
role: symbol
role_heading: Case
path: realitykit/forcemode/force
---

# ForceMode.force

A constant force or torque applied to a body, influencing motion over time.

## Declaration

```swift
case force
```

## Discussion

Discussion The quantity that user sets via setForce(_:index:) has the units of mass * distance /  time^2. i.e. a force ( mass * acceleration ). force mode causes a change in acceleration that varies proportionally to a body’s mass. The quantity that user sets via setTorque(_:index:) has the units of mass * distance^2 / time^2. force mode causes a change in angular acceleration that varies proportionally to a body’s mass and inertia.