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# SKPhysicsJoint

The abstract superclass for objects that connect physics bodies.

```
class SKPhysicsJoint
```

## Overview

An [`SKPhysicsJoint`](/documentation/SpriteKit/SKPhysicsJoint) object connects two physics bodies so that they are simulated together by the physics world. You never instantiate objects of this class directly; instead, you instantiate one of the subclasses that defines the kind of joint you want to make.

## Topics

### Connecting Bodies with Joints

[Connecting Bodies with Joints](/documentation/SpriteKit/connecting-bodies-with-joints)

Add joints to nodes in your scene.

### Disconnecting Bodies from Joints

[Disconnecting Bodies from Joints](/documentation/SpriteKit/disconnecting-bodies-from-joints)

Disconnect joints from nodes in your scene.

### Accessing or Setting a Joint’s Bodies

[`bodyA`](/documentation/SpriteKit/SKPhysicsJoint/bodyA)

The first body connected by the joint.

[`bodyB`](/documentation/SpriteKit/SKPhysicsJoint/bodyB)

The second body connected by the joint.

### Reading the Stress and Speed that Are Currently Applied to a Joint

[`reactionForce`](/documentation/SpriteKit/SKPhysicsJoint/reactionForce)

The instantaneous reaction force, in newtons, currently being directed at the anchor point.

[`reactionTorque`](/documentation/SpriteKit/SKPhysicsJoint/reactionTorque)

Instantaneous reaction torque, in newton-meters,  currently being directed at the anchor point.


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