My appologies for such a lame question, but it has been near 50 years since physics in college, and not much use since. A friend helped another to pick up a very large and heavy door. As the second person was taller than he, he was under the impression that he had the "heavy' end of the door (he was donwhill so to speak). I stated no, that both ends were equally "heavy" and both lifters were equally sharing the load. As the vertical lifting distance between them was approximately four inches I felt there was no significant difference in the gravitational force. I hope I'm right and someone can give me the logical explanation for this, may be even a formula?