In unity you can relate two bodies to transform by parenting one to the other.
Unity hinge joint door example.
The hinge joint 2d component allows a gameobject the fundamental object in unity scenes which can represent characters props scenery cameras waypoints and more.
Also this joint is used when you want two connected bodies apart.
Playing with the same concept more or less this week experimented some with 2d unity joints i think the issue you are having is identical to one i had yesterday the force you are applying breaks joints for some frames hence that almost spring joint effect make sure the mass and or force applied are not too heavy also maybe increase the chain parts mass makes the joints more solid too.
This joint simulate pendulum.
This joint restricts the movement of a rigid body to follow the movement of the rigid body it is attached to.
Multiple hinge joints can also be strung together to create a chain.
More info see in glossary controlled by rigidbody a component that allows a gameobject to be affected by simulated gravity and other forces.
The main door should be assigned as the connected body so the doggy door s hinge is dependent on the main door s rigidbody.
You do not need to assign a connected body to.
But this joint can be used to do the same.
A single hinge joint should be applied to a gameobject the fundamental object in unity scenes which can represent characters props scenery cameras waypoints and more.
A gameobject s functionality is defined by the components attached to it.
More info see in glossary the hinge will rotate at the point specified by the anchor property moving around the specified axis property.
How to open doors on a hinge like a real door.
Unity 4 6 hinge joint broken in asset bundles.
Physics hingejoint rigidbody hinge motor joint joints 2d collision door rotation rope anchor spring javascript connectedbody rigidbody2d axis animation c swinging submesh unity 5 hang wheel collider.
A gameobject s functionality is defined by the components attached to it.