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I always wanted to write the physics textbook from which I would have liked to learn the subject when I was young.
Originally posted by Mary Rose
The Adventure of Physics - Vol. I - Fall, Flow and Heat
At present, at the beginning of our walk, we simply note that history has shown that
classifying the various types of motion is not productive. Only by trying to achieve maximum precision can we hope to arrive at the fundamental properties of motion. Precision, not classification, is the path to follow. As Ernest Rutherford said: ‘All science is either physics or stamp collecting.’
quotationsbook.com...
Originally posted by Mary Rose
I don't get this: "As Ernest Rutherford said: ‘All science is either physics or stamp collecting.’"
Thanks for asking. I never knew the periodic table of the elements was a form of "stamp collecting", and I used to collect stamps.
Rutherford was distinguishing between two levels of the scientific method: the second and the fifth. The first level is collecting data; the second is organizing the data, usually in the form of taxonomy; the third is developing one or more hypotheses that explain the relationship among the data; the fourth is testing the hypotheses to accept or reject them; the final level is the development of a theory that is confirmatory and predictive. Stamp collectors take data (stamps) and organize the data by the value of the postage, the date of the printing or postmark and the country of origin. There are never any hypotheses concerning the reasons for such organization and certainly no theories. An analog in chemistry was the development of the periodic table based on a linearly increasing atomic weight and a folding according to chemical activity. This occurred about 50 years before the theory of electron shells and about a decade after Rutherford’s statement. Thus the periodic table was for Rutherford an example of stamp collecting, while physics had developed theories of classical mechanics, electricity and magnetism, thermodynamics, relativity and quantum mechanics.
Rutherford probably meant his statement as more of a tease than a dogma. Some physicists, even knighted ones, have a sense of humor.
Originally posted by Arbitrageur
quotationsbook.com...
Not every movement is a good standard for time. In the year 2000 an Earth rotation did not take 86 400 seconds any more, as it did in the year 1900, but 86 400.002 seconds. Can you deduce in which year your birthday will have shifted by a whole day from the time predicted with 86 400 seconds?
When Galileo studied motion in the seventeenth century, there were as yet no stopwatches. He thus had to build one himself, in order to measure times in the range between a fraction and a few seconds. Can you imagine how he did it?
Do you dislike formulae? If you do, use the following three-minute method to change
the situation. It is worth trying it, as it will make you enjoy this book much more. Life is
short; as much of it as possible, like reading this text, should be a pleasure.
1. Close your eyes and recall an experience that was absolutely marvellous, a situation
when you felt excited, curious and positive.
2. Open your eyes for a second or two and look at page 226 – or any other page that
contains many formulae.
3. Then close your eyes again and return to your marvellous experience.
4. Repeat the observation of the formulae and the visualization of your memory – steps
2 and 3 – threemore times.
Then leave the memory, look around yourself to get back into the here and now, and test
yourself. Look again at page 226. How do you feel about formulae now?
Originally posted by Arbitrageur
. . . it's an interesting style.
Originally posted by Arbitrageur
I might try with my students at some point.
A request
The text is and will remain free to download from the internet. In exchange, I would
be delighted to receive an email from you at [email protected], especially on the
following issues:
— What was unclear Challenge 1 s and should be improved?
— What story, topic, riddle, picture or movie did you miss?
— What should be corrected?
Alternatively, you can provide feedback online, on www.motionmountain.net/wiki. The
feedback will be used to improve the next edition. On behalf of all readers, thank you in
advance for your input. For a particularly useful contribution you will be mentioned – if
you want – in the acknowledgements, receive a reward, or both. But above all, enjoy the
reading!
Originally posted by Mary Rose
I didn't know you were a teacher, Arbitrageur. I used to teach, too - 8th grade English.
You got me there, ask me about engineering, physics, statistics, business management, maybe even some math, and I might be able to answer, but I need to ask the English teachers about the finer points of grammar. I still have problems with this one:
Originally posted by Mary Rose
Did I use proper grammar?
I guess "whom" often sounds forced or unnatural to me so I'm probably guilty of incorrect usage. I think it's supposed to be "whom did you go to the party with?" Right? But who actually says that? I hear "who did you go to the party with?" so even though that's probably wrong, it seems to be common usage?
The correct usage of these troublesome pronouns is often ignored in speech and informal writing when the word "whom" would sound forced or unnatural.