When you push or pull with a simple machine, you are applying a force and doing work. And, if you get more force out of a machine than you put into it, then that machine has a mechanical advantage.

Hundreds of thousands of years before the invention of the wheel, some unlucky hominin stepped on a loose rock or unstable log and—just before they cracked their skull—discovered that a round object ...

Before we get too far into this festival of definitions and hair-splitting, it is important to know that – absent of all other considerations – power to all four wheels simply gets you up to crashing ...