On Wednesday, 31 July 2013 at 23:26:32 UTC, Walter Bright wrote:
On 7/31/2013 3:58 PM, John Colvin wrote:
It's a quite impressively unbalanced education that provides
memory allocation strategies, hashing and the performance
pitfalls of integer
division, but not something as basic as a speed.
Have you ever seen those cards that some "electrical engineers"
carry around, with the following equations on them:
V = I * R
R = V / I
I = V / R
I found it:
Unbelievable. The author of it writes:
"I'm going to explain to you how to use this cheat sheet in
case you've never seen this before."
Makes you want to cry.
Something I discovered during my studies when helping other is
that most people to not even try to understand this kind of
stuff. They simply brute-force the equation to their memory and
regurgitate it as needed without understanding anything. Not
because their aren't capable of understanding, simply because
they never figured out that equation actually are saying
something (and the teaching style often do not help here). They
do not relate the equation to actual phenomenon they observe.
A nice example is the very basic mass times acceleration equals
Granted that acceleration is the variation of speed, this
equation means the following :
- If you push something it will start to move.
- If you continue pushing it will move faster and faster.
- If you do not push, it won't move (or continue moving the way
- The heavier it is, the harder it is to move that something.
Any child knows all the above, it is experienced it in everyday
life. And the equation is simply the mathematical notation of
this very basic experience.
If you don't relate such equation to anything real, you'll have
all kind of trouble remembering it, knowing when to use it or how
to use it.