it all depends on what size, how thick,etc.
I need a screen door hung that is heavy and is used a lot..
Heavy enough so four carts couldnt pull it
A steel door stop would be closer to 7 kilograms. Typically, door stops are not very heavy and 70 kilograms would be extremely heavy for a door stop.
The heavy door is meant to keep things out, like invaders. Also you have a better way of escaping while under attack
You can prevent a door from closing by using a door stopper, wedging a doorstop or a heavy object under the door, or by installing a door closer mechanism that controls the speed of the door closing.
Depends on what type of door you're referring to...
because you can stub your toe or they can get in the way
kinetic energy
force is push and pull
They have to calculate the weight of the door so they know how heavy it is.
One way to keep a door open without using a door stop is to place a heavy object, such as a weight or a book, on the floor behind the door to hold it open.
To remove a sliding door, first lift the door up and tilt it towards you. Then, carefully lift the bottom of the door off the track and slide it out of the frame. Be sure to have someone help you if the door is heavy.