Knowledge: becoming an everyday part of the mind

Workout notes
Weights only. I was sort of distracted; I went at noon and there were people there. One young man did vertical sit ups while hanging upside down from a bar…with extra weights.

I wasn’t that impressive. šŸ™‚

Hip Hikes, Achilles, Abs (3 sets of 10: v. crunch, crunch, sit back), squats: 4 sets of 5: 45, 65, 95, 95. The last sets were easier.
Pull ups: 2 sets of (3 x 5), 1 set of (2 x 5), 1 set of 10
bench: 10 x 135, 4 x 185, 8 x 170
incline: 7 x 150, 5 x 150 (very distracted on the last set…my head wasn’t in it)
seated military: 3 sets of 12 x 50
rows: 3 sets of 10 x 65
pull downs: 3 sets of 10 x 160
curls (pulley) 3 sets of 10 x 57.5

I am going to have to jazz it up a bit. I appear to be “stuck”.

The weather was pleasant so I just cut grass and gave the legs a day off. I ran on Tuesday, Thursday, Friday, Saturday.

I had some conversations with my daughter. I warned her that there is a difference in depth of knowledge and how one uses it.
There is the level of knowledge in that you can, say, “do” a physics problem that is presented to you.
Now given a general problem and figuring out WHAT physics problem it is: that is a higher level knowledge.
Higher still: is having that knowledge as a daily working part of the brain.

Here is an example of this in action:

Imagine a ball on a string that is going around a center pole (like a tether ball). If the string is suddenly cut, how does the ball travel: in a curved path or a straight line? Answer: find out here. For many of us, our “common sense” tells us that if the ball has a curvy path and then the string is cut, the ball still has some “curviness” left; it is an “impetus” type of physics.

What is going on? Well, part of it is that it takes time for new knowledge to seep though the brain. Part of it is that new knowledge is often taught in simplified form.

Example: when we do the “fire a bullet straight up in the air” problem, IF we neglect air resistance, the bullet returns to the muzzle height at muzzle velocity. Now when we factor in air resistance, that isn’t quite true, but it does come down fast enough to be lethal in some cases and fast enough to cause injury in any event.

Still, you can’t convince some people that firing a gun into the air is NOT harmless!

I also remember the days of discussing curveballs in baseball. Yes, they do follow a “curved line” path (the spinning ball causes pressure differences which moves the ball sideways) but, in spite of how they look to a batter, they do NOT go straight and suddenly shift direction.

And if you think that moving objects is easy to analyze, read this article about boomerangs.

So my summary:

1. It takes time for classroom knowledge to become everyday working knowledge
2. One has to be intellectually mature enough to know what simplifications are made in the classroom and how they affect the predictions that one might make. Reality often induces a need for correction factors (e. g. friction, air resistance, etc.)

More articles:
Still, there are some who will NOT change their minds no matter how much evidence to the contrary is presented! There is a fine line between rejecting a general principle based on either an exceptional event or a “false positive” and hanging on to a long discredited hypothesis.

IMHO, a conservative is someone who is prone to making Type II errors and a liberal is prone to making Type I error.

Evolutionary behavior
This bird will lure you away from its nest…and even feign injury to get you to attack IT and leave its eggs alone!


June 30, 2013 - Posted by | evolution, nature, physics, science, weight training | , ,

No comments yet.

Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Google+ photo

You are commenting using your Google+ account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )


Connecting to %s

%d bloggers like this: