I'm definitely no physics major, and I'm still trying to grasp the concept of Work = Force x Distance. Scenario: Let's say I'm dragging a huge rock with a rope, and after two minutes of pulling (non-variable force) I manage to drag it 20 feet. Now, let's say I pull it another 20 feet, but this time I pull twice as hard, and get the job done in only a minute. Did I do twice as much work the second time? I guess that fits the formula. But intuitively I'm thinking that I did the same amount of work: I was pulling twice as hard, but only half as long.

...?