Choosing Physics: Why and When?

I’ve gotten a few questions from my adopters on when I decided to study physics. I had actually made that call in high school, so I went into college already having declared my major. I didn’t really know what a physicist did, but the subject was more interesting to me than the other science classes I had taken, and the thought of what I would do with the degree hadn’t yet entered my mind. My parents encouraged me, but they didn’t have a science background, so that was a general push toward learning and not so much in the direction of science.

Bad teaching wasn’t a factor in my decision. My middle-school teachers were good, and in high school I had a good teacher for earth science, but the material didn’t excite me tremendously. I had the same teacher for chemistry and my first physics course, so there was no bias there. But there were parts of chemistry that just didn’t click with me. Being sick and missing a week of school while we were learning LeChatlier’s principle didn’t help. Trying to learn new material while being spotty on basic concepts is a huge hurdle to overcome. Biology was eliminated very early in the game — I never took it in high school because a dissection was something that would make my joints and muscles turn to jello, and then there was the propensity to be ill. Yuck! I do enjoy learning about biology-related things like evolution and paleontology, just as long as I’m not exposed to greasy grimy gopher guts or the equivalent.

The other thing pushing me toward physics was my next-door neighbors. The father (Mr. H) was an engineer and he had a son (Tom) who was a few years older than me. We did several projects that were physics-related, though I didn’t really know it at the time. Mr. H loved steam engines, locomotives (especially steam-driven ones) and dams (hydro power, either electrical or mechanical), and I recall going on outings to see all three kinds of things. They had a small steam engine model (one mousepower) that we played with, as well as some other “toys.”

When Tom started taking physics and learned of the monkey-and-hunter problem (monkey in tree, and drops as soon as you shoot — where do you aim? Right at him, since gravity pulls both the monkey and bullet down at the same acceleration: g) we set up an experiment in his basement. A blowgun and a target that was attached to an electromagnet, and would drop when the dart left the barrel of the blowgun (the dart touched a thin wire that completed a circuit and opened a relay) and sure enough, if you aimed at the target, it would generally hit it. I was hooked. Even though formal instruction into basic physics was sometimes a little dry, I kept with it, because of the hints of really interesting things later that paid off.

What Goes Up Must … Go Up

An audio “illusion.” The pitch increases, and seems to continue when you replay the clip.

You need to a flashplayer enabled browser to view this YouTube video

This phenomenon is known as Shepard’s paradox; the ending tones are the same as the beginning ones, so it’s the auditory equivalent of Escher’s “Ascending and Descending” perpetual staircase.

Navigation = Time

I see Chad’s put a brief review of Dava Sobel’s Longitude up over at Uncertain Principles.

I read the book a few years ago and can confirm that it’s a good read. (I missed a chance to hear Sobel give a talk at a conference a few years back — I was sick (>1.0 dogs) and crashed rather than attend the talk.)

The idea behind Harrison’s solution to the longitude problem (knowing the location of a star and what time it is tells you your longitude) is still with us: ‘to know where you are, you need good clocks’ applies to GPS, too.

Tag!

The other morning I made sure to tell a colleague about Whiteboard Tower Defense, a potentially addictive flash game. The colleague is giving a talk next week and in the finest tradition of physics research, had barely started to assemble his powerpoint slides and was starting to stress a little. So a time-wasting diversion is just what he didn’t need, but was in retaliation for him sending me links about some cool new iPhone/iPod Touch apps he got. I don’t have an iPod Touch or an iPhone. He knows this.

Anyway, I’m going to the same conference, so posting will be a little light for the next week.

Are You Eyeballing Me?

The eyeballing game

The game works by showing you a series of geometries that need to be adjusted a little bit to make them right. A square highlights the point that needs to be moved or adjusted. Use the mouse to drag the blue square or arrowhead where you feel it is ‘right’. Once you let go of the mouse, the computer evaluates your move, so don’t let up on the mouse button until you are sure. The ‘correct’ geometry is also shown in green. To avoid the need for extra mouse clicks, a mouse button up counts as the move being finished, so be careful.

You will be presented with each challenge three times. The table to the right shows how you did on each challenge each time.