If you’ve ever gone over simple machines in school, chances are—depending on when you took the course—there wasn’t a lot of math involved in the explanation. And if there was, it was pretty basic. It probably involved an absolute minimum of variables: when talking about pulleys, for instance, the teacher almost certainly didn’t include factors like friction, tension, sway, or sweaty hands. (That last one is hard to calculate mathematically, but definitely matters a good bit.)
With ramps, friction is the biggest variable left out; it’s a real pain to calculate. Often, teachers will just do the math with an idealized, frictionless ramp. Makes it really easy for students to figure out but gets a little ridiculous if you try to think about actually trying to use the thing—pure slapstick, really, and slapstick is one kind of humor you don’t want in the workplace.
Now, I’m not a great teacher, but I like to think I do an okay job at it. I helped the kids out with their math in school (I still do help one of the boys with some of his math from work, not naming any names), and I spent years using slide rules before converting to a calculator. I know my math, and I know how to show people how to do it. (No way I could put in the kind of dedication a real teacher does, though.)
So when one of the young guys at work came to me for some help with some math, I was happy to help. The kid thought he’d figured out a way to improve efficiency when loading and unloading. Given how much trouble he is at work, I really hoped this meant he was starting to actually care about his job. Didn’t think anything would come of his ideas, but at least he was trying, right?
Well, come the day he was to test out the idea, it turns out I’d taught him with the idealized frictionless ramp model. That should have resulted in a mess on its own but, luckily for me, his big mistake had nothing to do with my assistance.
The dumb kid hadn’t read the instructions on the ramp he was using. Should have lost his job, but kept it for the same reason he got it. Sometimes it’s about who you know. At least he got transferred to his dad’s department, so I don’t have to deal with him anymore.