rojo/.cursor/rules/roblox/physics/constraints/angular-velocity.md

title	description
AngularVelocity	The AngularVelocity constraint applies torque on an assembly to maintain a constant angular velocity.

For an overview on creating, visualizing, and simulating mover constraints, including `Class.AngularVelocity`, see [Mover constraints](../../physics/mover-constraints.md). Also see [Roblox units](../../physics/units.md) to understand how Roblox units compare to metric units.

An Class.AngularVelocity constraint applies torque on an assembly to maintain a constant angular velocity.

The `Class.AngularVelocity` constraint applies torque that attempts to maintain a **constant** angular velocity. If you want to control the amount of torque applied, use a [Torque](../../physics/constraints/torque.md) constraint. Alternatively, if you only need **initial** angular velocity, set the `Class.BasePart.AssemblyAngularVelocity|AssemblyAngularVelocity` method directly on the assembly.

Relativity

Application of velocity can be controlled through the constraint's Class.AngularVelocity.RelativeTo|RelativeTo property. If set to Enum.ActuatorRelativeTo|World, the angular velocity vector is used as is. If set to Enum.ActuatorRelativeTo|Attachment1 and the constraint's Class.Constraint.Attachment1|Attachment1 property is set to another attachment, the angular velocity will be affected by that of the other attachment as seen by how the upper-left red part's velocity affects the attached blue part's velocity.

RelativeTo = **World**

RelativeTo = **Attachment1**

Setting `Class.AngularVelocity.RelativeTo|RelativeTo` to `Enum.ActuatorRelativeTo|Attachment1` also exposes the `Class.AngularVelocity.ReactionTorqueEnabled|ReactionTorqueEnabled` property.