Neil Jones wrote:

wrote in message
...
Yes, it's balanced but the door still has a lot of inertia (i.e.
mass), when it swings down it bangs on those hinges whether you like
it or not. A non-integrated door simply has much less mass and
doesn't do so much damage.

pedant mode

you seem to be confusing inertia, mass and momentum here

Inertia and mass are basically the same in this context. Momentum is
a consequence of moving mass.

Whatever I'm confusing a heavy door, even if perfectly
counterbalanced, will still bang against its endstops harder than a
light one will.

--
Chris Green