# HasPhysicsBody An interface that enables physics simulations based on the rules of Newtonian mechanics. ``` @MainActor @preconcurrency protocol HasPhysicsBody : HasCollision ``` ## Topics ### Getting the component [`var physicsBody: PhysicsBodyComponent?`](/documentation/RealityKit/HasPhysicsBody/physicsBody) A component that is used for physics simulations of the model entity in accordance with the laws of Newtonian mechanics. ### Adding and clearing forces [`func addForce(SIMD3, relativeTo: Entity?)`](/documentation/RealityKit/HasPhysicsBody/addForce(_:relativeTo:)) Applies a force to the physics body at its center of mass. [`func addForce(SIMD3, at: SIMD3, relativeTo: Entity?)`](/documentation/RealityKit/HasPhysicsBody/addForce(_:at:relativeTo:)) Applies a force to the physics body at the specified position. [`func addTorque(SIMD3, relativeTo: Entity?)`](/documentation/RealityKit/HasPhysicsBody/addTorque(_:relativeTo:)) Applies a torque to the physics body at its center of mass. [`func clearForcesAndTorques()`](/documentation/RealityKit/HasPhysicsBody/clearForcesAndTorques()) Clears all forces previously added to the physics body. ### Applying impulses [`func applyLinearImpulse(SIMD3, relativeTo: Entity?)`](/documentation/RealityKit/HasPhysicsBody/applyLinearImpulse(_:relativeTo:)) Applies an impulse to the physics body at its center of mass. [`func applyAngularImpulse(SIMD3, relativeTo: Entity?)`](/documentation/RealityKit/HasPhysicsBody/applyAngularImpulse(_:relativeTo:)) Applies an angular (torque) impulse to the physics body at its center of mass. [`func applyImpulse(SIMD3, at: SIMD3, relativeTo: Entity?)`](/documentation/RealityKit/HasPhysicsBody/applyImpulse(_:at:relativeTo:)) Applies an impulse to the physics body at the specified position. ### Resetting physics simulations [`func resetPhysicsTransform(recursive: Bool)`](/documentation/RealityKit/HasPhysicsBody/resetPhysicsTransform(recursive:)) Resets the position, orientation, and velocities of the simulated physics body. [`func resetPhysicsTransform(Transform, recursive: Bool)`](/documentation/RealityKit/HasPhysicsBody/resetPhysicsTransform(_:recursive:)) Resets the position and velocities of the simulated physics body. ## Relationships ### Inherited By [`HasPhysics`](/documentation/RealityKit/HasPhysics) ### Inherits From [`HasTransform`](/documentation/RealityKit/HasTransform) [`HasCollision`](/documentation/RealityKit/HasCollision) ### Conforming Types [`ModelEntity`](/documentation/RealityKit/ModelEntity) --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)