Hello, I have trouble to get what work is. I find physics notions difficult to understand and I'm kinda bit astray like Rainman in that movie when he walks that moving walkway the wrong way, realizing he's not progressing. Could you, please, explain me with human words what work really represent? W = ||F|| . cos(a) . d Knowing that "d" value will be affected by the inertness of the mass, should I consider "d" as a coefficient of efficiency? Is "d" supposed to be the distance covered by the body "after" the given force be applied on it because if so, in my intuition without any time factor taken into account, I hardly imagine any distance covered, time rules everything, moreover upon a perfect frictionless ice the body would never stop after the force be applied on so that "d" would be undefinite. Thanks for helping because physics formulas are for me as weird as multiplying apples with bananas and seeing watermelons come out.