It is impossible for the elephant and the robin to have the same amount of force because if they are dropped at different heights they shall fall to earth close to the same time.
The surface area
A giant elephant
On both it has the same amount of gravity but it has a different amount of force. The elephant might weighmore than the cat but they both have the exact same amount of gravity, or as others say it, acceleration. So the answer would be that it pull down on both of them with an equal amount of force.
Electromagnetic force field.
The surface area
Currently science has not been able to create one and remains subject to science fiction
Yes. An elephant has a greater mass than a mouse and therefore experiences more gravitational force.
Elephant. :)
Hannibal.
Its not easy to overcome the repulsive force between nuclei.
If you drop an elephant and an equal weight amount of feathers, the elephant will hit the ground first. The elephant falls faster than the feather because it never reaches a terminal velocity; it continues to accelerate as it falls accumulating more and more air resistance.
No, the mechanical advantage is greater than 1. If you input a force of 1 unit you get out a force of 1+ units. However keep in mind that if this were a PERFECT machine the amount of WORK INPUT is EQUAL to the the amount of WORK OUTPUT. Since perfection is not possible, and there are frictional losses this is not possible. Otherwise you could have a perpetual motion machine, which is not yet possible.