So you put a guy on his back, legs and hands up, like an upside down dog
Then you have him support an 8 dia. piece of plywood on his hands and feet.
Then you spread 30lbs. of square shot (so it does not roll off) evenly on the board.
Then you ask him to lower the board and push up as fast as he can, and then ask him on a scale of one to ten, how hard it was.
Take the same guy on his back, except with a 4 dia. piece of plywood (of a thickness that equals the same weight of the 8 dia.) and place the same thirty pounds of square shot on the board.
Then you ask him to lower the board and push up as fast as he can, and ask him on a scale of one to ten, how hard it was.
All things being equal, he used the same energy and force (other than the extra air resistance for the larger dia.)
In other words, he did not have to be stronger to push the smaller dia. board that was carrying the same weight/mass.
Right?
