There is a word engines love to brag about, and that word is power. A sports car shouts it. A lawnmower mumbles it. But what IS power, really? Here's the twist: power isn't about how strong something is. It's about how FAST it gets a job done.

Let's start one step earlier, with a word called work. To a scientist, work just means moving something. Pushing a box across the floor is work. Lifting a bag of groceries is work. No moving, no work — even if your arms are tired from holding still.

Now, you could move that box slowly, taking all afternoon. Or you could move the very same box quickly, in two seconds flat. Either way, the same work gets done. The difference is the time it takes. And that difference has a name.

Power is simply work divided by time. It's how much work you do each second. Do a lot of work in a little time, and you have lots of power. Do the same work slowly, and your power is small. Power isn't the muscle — it's the hustle.

So strength and power are not the same thing. A patient ox and a sprinting cheetah might move the very same load up the very same hill. But the cheetah does it in a blink, and the ox takes its sweet time. Same work — cheetah wins on power.

Now back to our two machines. Inside the lawnmower, a tiny engine sips a little fuel and makes a small, steady push — just enough to spin a blade and trim the grass. It's perfectly happy doing a modest job at a modest pace.

The sports car's engine is a whole other beast. It burns far more fuel every second, and it burns it FAST. All that quick burning lets it do an enormous amount of work in barely any time — which is exactly what big power means.

That's why the same hill that the lawnmower would creep up, the sports car flings itself up in seconds. The car isn't doing magic. It's just doing buckets of work per second, while the mower does thimbles. More work, less time, more power.

So next time an engine brags about its power, you'll know its secret. Power is just the answer to one cheeky question: "How fast can you get the job done?" The mower says, "Eventually." The sports car says, "Already finished." Same work. Wildly different hustle.