I've noticed that people who have a hard time in intro-to-physics classes usually fail in a fairly predictable way: they see a problem, don't know how to solve it, and stop. But there's a trick to solving physics problems when you're not sure how. The general method is:

  1. Make a diagram or something, to depict what you know about the problem and make it easier to figure out stuff you don't know.

  2. Look at the problem until you can derive something you don't already know. Even if you have no idea how it will help (or if it will help) do the calculations, and

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Thank you for sharing this technique. It's similar to what I use, but put in to words far better than I've managed before. Hopefully it will be of help to my friend who has recently thrown themselves back in to the study of math :)

8NancyLebovitz9y That's like something I've found works with Colour Shift [http://www.kongregate.com/games/mrsneeze/colourshift]-- even if you can't see how to hook up a circuit and get the right colour, getting all the bulbs with the same colour on one circuit can be much more helpful than assuming that the part you've already got working shouldn't be messed with.

Cheat codes

by sketerpot 9y1st Dec 20101 min read93 comments


Most things worth doing take serious, sustained effort. If you want to become an expert violinist, you're going to have to spend a lot of time practicing. If you want to write a good book, there really is no quick-and-dirty way to do it. But sustained effort is hard, and can be difficult to get rolling. Maybe there are some easier gains to be had with simple, local optimizations. Contrary to oft-repeated cached wisdom, not everything worth doing is hard. Some little things you can do are like cheat codes for the real world.

Take habits, for example: your habits are not fixed. My diet got dramatically better once I figured out how to change my own habits, and actually applied that knowledge. The general trick was to figure out a new, stable state to change my habits to, then use willpower for a week or two until I settle into that stable state. In the case of diet, a stable state was one where junk food was replaced with fruit, tea, or having a slightly more substantial meal beforehand so I wouldn't feel hungry for snacks. That's an equilibrium I can live with, long-term, without needing to worry about "falling off the wagon." Once I figured out the pattern -- work out a stable state, and force myself into it over 1-2 weeks -- I was able to improve several habits, permanently. It was amazing. Why didn't anybody tell me about this?

In education, there are similar easy wins. If you're trying to commit a lot of things to memory, there's solid evidence that spaced repetition works. If you're trying to learn from a difficult textbook, reading in multiple overlapping passes is often more time-efficient than reading through linearly. And I've personally witnessed several people academically un-cripple themselves by learning to reflexively look everything up on Wikipedia. None of this stuff is particularly hard. The problem is just that a lot of people don't know about it.

What other easy things have a high marginal return-on-effort? Feel free to include speculative ones, if they're testable.