# Joint2D

> Parent class for joints to connect Rigidbody2D objects.

## Definition

* **Type:** Class
* **Namespace:** [UnityEngine](/engine/6000.7/script-reference/unityengine.md)
* **Assembly:** UnityEngine.Physics2DModule
* **Inherits from:** [Behaviour](/engine/6000.7/script-reference/unityengine/behaviour.md)

```csharp
[RequireComponent(typeof(Transform), typeof(Rigidbody2D))]
public class Joint2D : Behaviour
```

## Remarks

Additional Resources: [AnchoredJoint2D](/engine/6000.7/script-reference/unityengine/anchoredjoint2d.md)

## Properties

| Property                                                                                      | Description                                                                                                                                                                                                        |
| --------------------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| [attachedRigidbody](/engine/6000.7/script-reference/unityengine/joint2d/attachedrigidbody.md) | The [Rigidbody2D](/engine/6000.7/script-reference/unityengine/rigidbody2d.md) attached to the [Joint2D](/engine/6000.7/script-reference/unityengine/joint2d.md).                                                   |
| [breakAction](/engine/6000.7/script-reference/unityengine/joint2d/breakaction.md)             | The action to take when the joint breaks the [breakForce](/engine/6000.7/script-reference/unityengine/joint2d/breakforce.md) or [breakTorque](/engine/6000.7/script-reference/unityengine/joint2d/breaktorque.md). |
| [breakForce](/engine/6000.7/script-reference/unityengine/joint2d/breakforce.md)               | The force that needs to be applied for this joint to break.                                                                                                                                                        |
| [breakTorque](/engine/6000.7/script-reference/unityengine/joint2d/breaktorque.md)             | The torque that needs to be applied for this joint to break.                                                                                                                                                       |
| [connectedBody](/engine/6000.7/script-reference/unityengine/joint2d/connectedbody.md)         | The Rigidbody2D object to which the other end of the joint is attached (ie, the object without the joint component).                                                                                               |
| [enableCollision](/engine/6000.7/script-reference/unityengine/joint2d/enablecollision.md)     | Should the two [Rigidbody2D](/engine/6000.7/script-reference/unityengine/rigidbody2d.md) connected with this joint collide with each other?                                                                        |
| [reactionForce](/engine/6000.7/script-reference/unityengine/joint2d/reactionforce.md)         | Gets the reaction force of the joint.                                                                                                                                                                              |
| [reactionTorque](/engine/6000.7/script-reference/unityengine/joint2d/reactiontorque.md)       | Gets the reaction torque of the joint.                                                                                                                                                                             |

## Methods

| Method                                                                                        | Description                                                           |
| --------------------------------------------------------------------------------------------- | --------------------------------------------------------------------- |
| [GetReactionForce](/engine/6000.7/script-reference/unityengine/joint2d/getreactionforce.md)   | Gets the reaction force of the joint given the specified `timeStep`.  |
| [GetReactionTorque](/engine/6000.7/script-reference/unityengine/joint2d/getreactiontorque.md) | Gets the reaction torque of the joint given the specified `timeStep`. |

## Inheritance

**Inherited Members:**

* [Behaviour.enabled](/engine/6000.7/script-reference/unityengine/behaviour/enabled.md)
* [Behaviour.isActiveAndEnabled](/engine/6000.7/script-reference/unityengine/behaviour/isactiveandenabled.md)
* [Component.GetComponent(Type)](/engine/6000.7/script-reference/unityengine/component/getcomponent.md#getcomponent\(type\))
* [Component.GetComponent\<T>()](/engine/6000.7/script-reference/unityengine/component/getcomponent.md)
* [Component.TryGetComponent(Type, Component)](/engine/6000.7/script-reference/unityengine/component/trygetcomponent.md)
* [Component.TryGetComponent\<T>(T)](/engine/6000.7/script-reference/unityengine/component/trygetcomponent.md)
* [Component.GetComponent(string)](/engine/6000.7/script-reference/unityengine/component/getcomponent.md#getcomponent\(string\))
* [Component.GetComponentInChildren(Type, bool)](/engine/6000.7/script-reference/unityengine/component/getcomponentinchildren.md#getcomponentinchildren\(type-bool\))
* [Component.GetComponentInChildren(Type)](/engine/6000.7/script-reference/unityengine/component/getcomponentinchildren.md#getcomponentinchildren\(type\))
* [Component.GetComponentInChildren\<T>(bool)](/engine/6000.7/script-reference/unityengine/component/getcomponentinchildren.md)
* [Component.GetComponentsInChildren(Type, bool)](/engine/6000.7/script-reference/unityengine/component/getcomponentsinchildren.md)
* [Component.GetComponentsInChildren\<T>(bool)](/engine/6000.7/script-reference/unityengine/component/getcomponentsinchildren.md#getcomponentsinchildrent\(bool\))
* [Component.GetComponentsInChildren\<T>(bool, List\<T>)](/engine/6000.7/script-reference/unityengine/component/getcomponentsinchildren.md)
* [Component.GetComponentsInChildren\<T>()](/engine/6000.7/script-reference/unityengine/component/getcomponentsinchildren.md#getcomponentsinchildrent\(\))
* [Component.GetComponentsInChildren\<T>(List\<T>)](/engine/6000.7/script-reference/unityengine/component/getcomponentsinchildren.md)
* [Component.GetComponentInParent(Type, bool)](/engine/6000.7/script-reference/unityengine/component/getcomponentinparent.md#getcomponentinparent\(type-bool\))
* [Component.GetComponentInParent(Type)](/engine/6000.7/script-reference/unityengine/component/getcomponentinparent.md#getcomponentinparent\(type\))
* [Component.GetComponentInParent\<T>(bool)](/engine/6000.7/script-reference/unityengine/component/getcomponentinparent.md#getcomponentinparentt\(bool\))
* [Component.GetComponentInParent\<T>()](/engine/6000.7/script-reference/unityengine/component/getcomponentinparent.md#getcomponentinparentt\(\))
* [Component.GetComponentsInParent(Type, bool)](/engine/6000.7/script-reference/unityengine/component/getcomponentsinparent.md)
* [Component.GetComponentsInParent\<T>(bool)](/engine/6000.7/script-reference/unityengine/component/getcomponentsinparent.md#getcomponentsinparentt\(bool\))
* [Component.GetComponentsInParent\<T>(bool, List\<T>)](/engine/6000.7/script-reference/unityengine/component/getcomponentsinparent.md)
* [Component.GetComponentsInParent\<T>()](/engine/6000.7/script-reference/unityengine/component/getcomponentsinparent.md#getcomponentsinparentt\(\))
* [Component.GetComponents(Type)](/engine/6000.7/script-reference/unityengine/component/getcomponents.md#getcomponents\(type\))
* [Component.GetComponents(Type, List\<Component>)](/engine/6000.7/script-reference/unityengine/component/getcomponents.md#getcomponents\(type-listcomponent\))
* [Component.GetComponents\<T>(List\<T>)](/engine/6000.7/script-reference/unityengine/component/getcomponents.md)
* [Component.GetComponents\<T>()](/engine/6000.7/script-reference/unityengine/component/getcomponents.md#getcomponentst\(\))
* [Component.GetComponentIndex()](/engine/6000.7/script-reference/unityengine/component/getcomponentindex.md)
* [Component.CompareTag(string)](/engine/6000.7/script-reference/unityengine/component/comparetag.md#comparetag\(string\))
* [Component.CompareTag(TagHandle)](/engine/6000.7/script-reference/unityengine/component/comparetag.md#comparetag\(taghandle\))
* [Component.SendMessageUpwards(string, Object, SendMessageOptions)](/engine/6000.7/script-reference/unityengine/component/sendmessageupwards.md#sendmessageupwards\(string-object-sendmessageoptions\))
* [Component.SendMessageUpwards(string, SendMessageOptions)](/engine/6000.7/script-reference/unityengine/component/sendmessageupwards.md#sendmessageupwards\(string-sendmessageoptions\))
* [Component.SendMessage(string, Object)](/engine/6000.7/script-reference/unityengine/component/sendmessage.md#sendmessage\(string-object\))
* [Component.SendMessage(string)](/engine/6000.7/script-reference/unityengine/component/sendmessage.md#sendmessage\(string\))
* [Component.SendMessage(string, Object, SendMessageOptions)](/engine/6000.7/script-reference/unityengine/component/sendmessage.md#sendmessage\(string-object-sendmessageoptions\))
* [Component.SendMessage(string, SendMessageOptions)](/engine/6000.7/script-reference/unityengine/component/sendmessage.md#sendmessage\(string-sendmessageoptions\))
* [Component.BroadcastMessage(string, Object, SendMessageOptions)](/engine/6000.7/script-reference/unityengine/component/broadcastmessage.md#broadcastmessage\(string-object-sendmessageoptions\))
* [Component.BroadcastMessage(string, SendMessageOptions)](/engine/6000.7/script-reference/unityengine/component/broadcastmessage.md#broadcastmessage\(string-sendmessageoptions\))
* [Component.transform](/engine/6000.7/script-reference/unityengine/component/transform.md)
* [Component.transformHandle](/engine/6000.7/script-reference/unityengine/component/transformhandle.md)
* [Component.gameObject](/engine/6000.7/script-reference/unityengine/component/gameobject.md)
* [Component.tag](/engine/6000.7/script-reference/unityengine/component/tag.md)
* [Object.GetEntityId()](/engine/6000.7/script-reference/unityengine/object/getentityid.md)
* [Object.GetHashCode()](/engine/6000.7/script-reference/unityengine/object/gethashcode.md)
* [Object.InstantiateAsync\<T>(T)](/engine/6000.7/script-reference/unityengine/object/instantiateasync.md)
* [Object.InstantiateAsync\<T>(T, Transform)](/engine/6000.7/script-reference/unityengine/object/instantiateasync.md)
* [Object.InstantiateAsync\<T>(T, Vector3, Quaternion)](/engine/6000.7/script-reference/unityengine/object/instantiateasync.md)
* [Object.InstantiateAsync\<T>(T, Transform, Vector3, Quaternion)](/engine/6000.7/script-reference/unityengine/object/instantiateasync.md)
* [Object.InstantiateAsync\<T>(T, int)](/engine/6000.7/script-reference/unityengine/object/instantiateasync.md)
* [Object.InstantiateAsync\<T>(T, int, Transform)](/engine/6000.7/script-reference/unityengine/object/instantiateasync.md)
* [Object.InstantiateAsync\<T>(T, int, Vector3, Quaternion)](/engine/6000.7/script-reference/unityengine/object/instantiateasync.md)
* [Object.InstantiateAsync\<T>(T, int, ReadOnlySpan\<Vector3>, ReadOnlySpan\<Quaternion>)](/engine/6000.7/script-reference/unityengine/object/instantiateasync.md)
* [Object.InstantiateAsync\<T>(T, int, Transform, Vector3, Quaternion)](/engine/6000.7/script-reference/unityengine/object/instantiateasync.md)
* [Object.InstantiateAsync\<T>(T, int, Transform, Vector3, Quaternion, CancellationToken)](/engine/6000.7/script-reference/unityengine/object/instantiateasync.md)
* [Object.InstantiateAsync\<T>(T, int, Transform, ReadOnlySpan\<Vector3>, ReadOnlySpan\<Quaternion>)](/engine/6000.7/script-reference/unityengine/object/instantiateasync.md)
* [Object.InstantiateAsync\<T>(T, int, Transform, ReadOnlySpan\<Vector3>, ReadOnlySpan\<Quaternion>, CancellationToken)](/engine/6000.7/script-reference/unityengine/object/instantiateasync.md)
* [Object.InstantiateAsync\<T>(T, InstantiateParameters, CancellationToken)](/engine/6000.7/script-reference/unityengine/object/instantiateasync.md)
* [Object.InstantiateAsync\<T>(T, int, InstantiateParameters, CancellationToken)](/engine/6000.7/script-reference/unityengine/object/instantiateasync.md)
* [Object.InstantiateAsync\<T>(T, Vector3, Quaternion, InstantiateParameters, CancellationToken)](/engine/6000.7/script-reference/unityengine/object/instantiateasync.md)
* [Object.InstantiateAsync\<T>(T, int, Vector3, Quaternion, InstantiateParameters, CancellationToken)](/engine/6000.7/script-reference/unityengine/object/instantiateasync.md)
* [Object.InstantiateAsync\<T>(T, int, ReadOnlySpan\<Vector3>, ReadOnlySpan\<Quaternion>, InstantiateParameters, CancellationToken)](/engine/6000.7/script-reference/unityengine/object/instantiateasync.md)
* [Object.Instantiate(Object, Vector3, Quaternion)](/engine/6000.7/script-reference/unityengine/object/instantiate.md#instantiate\(object-vector3-quaternion\))
* [Object.Instantiate(Object, Vector3, Quaternion, Transform)](/engine/6000.7/script-reference/unityengine/object/instantiate.md#instantiate\(object-vector3-quaternion-transform\))
* [Object.Instantiate(Object)](/engine/6000.7/script-reference/unityengine/object/instantiate.md#instantiate\(object\))
* [Object.Instantiate(Object, Scene)](/engine/6000.7/script-reference/unityengine/object/instantiate.md#instantiate\(object-scene\))
* [Object.Instantiate\<T>(T, InstantiateParameters)](/engine/6000.7/script-reference/unityengine/object/instantiate.md)
* [Object.Instantiate\<T>(T, Vector3, Quaternion, InstantiateParameters)](/engine/6000.7/script-reference/unityengine/object/instantiate.md)
* [Object.Instantiate(Object, Transform)](/engine/6000.7/script-reference/unityengine/object/instantiate.md#instantiate\(object-transform\))
* [Object.Instantiate(Object, Transform, bool)](/engine/6000.7/script-reference/unityengine/object/instantiate.md#instantiate\(object-transform-bool\))
* [Object.Instantiate\<T>(T)](/engine/6000.7/script-reference/unityengine/object/instantiate.md)
* [Object.Instantiate\<T>(T, Vector3, Quaternion)](/engine/6000.7/script-reference/unityengine/object/instantiate.md)
* [Object.Instantiate\<T>(T, Vector3, Quaternion, Transform)](/engine/6000.7/script-reference/unityengine/object/instantiate.md)
* [Object.Instantiate\<T>(T, Transform)](/engine/6000.7/script-reference/unityengine/object/instantiate.md)
* [Object.Instantiate\<T>(T, Transform, bool)](/engine/6000.7/script-reference/unityengine/object/instantiate.md)
* [Object.Destroy(Object, float)](/engine/6000.7/script-reference/unityengine/object/destroy.md)
* [Object.DestroyImmediate(Object, bool)](/engine/6000.7/script-reference/unityengine/object/destroyimmediate.md)
* [Object.FindObjectsByType(Type)](/engine/6000.7/script-reference/unityengine/object/findobjectsbytype.md#findobjectsbytype\(type\))
* [Object.FindObjectsByType(Type, FindObjectsInactive)](/engine/6000.7/script-reference/unityengine/object/findobjectsbytype.md#findobjectsbytype\(type-findobjectsinactive\))
* [Object.DontDestroyOnLoad(Object)](/engine/6000.7/script-reference/unityengine/object/dontdestroyonload.md)
* [Object.FindAnyObjectByType\<T>()](/engine/6000.7/script-reference/unityengine/object/findanyobjectbytype.md#findanyobjectbytypet\(\))
* [Object.FindAnyObjectByType\<T>(FindObjectsInactive)](/engine/6000.7/script-reference/unityengine/object/findanyobjectbytype.md#findanyobjectbytypet\(findobjectsinactive\))
* [Object.FindObjectsByType\<T>()](/engine/6000.7/script-reference/unityengine/object/findobjectsbytype.md#findobjectsbytypet\(\))
* [Object.FindObjectsByType\<T>(FindObjectsInactive)](/engine/6000.7/script-reference/unityengine/object/findobjectsbytype.md#findobjectsbytypet\(findobjectsinactive\))
* [Object.FindAnyObjectByType(Type)](/engine/6000.7/script-reference/unityengine/object/findanyobjectbytype.md#findanyobjectbytype\(type\))
* [Object.FindAnyObjectByType(Type, FindObjectsInactive)](/engine/6000.7/script-reference/unityengine/object/findanyobjectbytype.md#findanyobjectbytype\(type-findobjectsinactive\))
* [Object.ToString()](/engine/6000.7/script-reference/unityengine/object/tostring.md)
* [Object.name](/engine/6000.7/script-reference/unityengine/object/name.md)
* [Object.hideFlags](/engine/6000.7/script-reference/unityengine/object/hideflags.md)

### Operators

| Operator                                                                           | Description                                                             |
| ---------------------------------------------------------------------------------- | ----------------------------------------------------------------------- |
| [operator ==](/engine/6000.7/script-reference/unityengine/object/op-equality.md)   | Compares two object references to see if they refer to the same object. |
| [bool](/engine/6000.7/script-reference/unityengine/object/op-implicit.md)          | Determines whether the object exists.                                   |
| [operator !=](/engine/6000.7/script-reference/unityengine/object/op-inequality.md) | Compares if two objects refer to a different object.                    |