I've just learned that work is done when a force moves something, and it's measured in joules. I've also learned that work = force x distance, but what significance does distance have? The force itself is what's being measured. In other words, if an object weighing 1kg was accelerated to 5m/s2 in a vacuum, what work have I applied on the object? Its distance is essentially infinite, because it keeps traveling without resistance. Also, if a 1kg object on earth is lifted (with a force of 9.8N), how does the distance make any difference? The force applied is still the same, regardless of how far the object travels. What exactly is 'work' measuring? Could someone please clarify how this works? Thanks for your help.