Physics 版 (精华区)
发信人: Rg (RedGardenia), 信区: Physics
标 题: feynman lecturson (2)
发信站: 哈工大紫丁香 (2002年08月15日12:07:33 星期四), 站内信件
Foreword
This book is based upon a course of lectures in introductory physics given by
Prof. R. P. Feynman at the California Institute of Technology during the
acade
mic
year 1961-62; it covers the first year of the two-year introductory course
tak
en by
all Caltech freshmen and sophomores, and was followed in 1962-63 by a
similar
series covering the second year. The lectures constitute a major part of a
fun
damental
revision of the introductory course, carried out over a four-year period.
The need for a basic revision arose both from the rapid development of
physics
in recent decades and from the fact that entering freshmen have shown a
steady
increase in mathematical ability as a result of improvements in high school
ma
thematics
course content. We hoped to take advantage of this improved mathematical
background, and also to introduce enough modern subject matter to make the
course challenging, interesting, and more representative of present-day
physic
s.
In order to generate a variety of ideas on what material to include and how
to
present it, a substantial number of the physics faculty were encouraged to
off
er
their ideas in the form of topical outlines for a revised course. Several
of t
hese
were presented and were thoroughly and critically discussed. It was agreed
alm
ost
at once that a basic revision of the course could not be accomplished
either b
y
merely adopting a different textbook, or even by writing one ab initio, but
th
at
the new course should be centered about a set of lectures, to be presented
at
the
rate of two or three per week; the appropriate text material would then be
pro
duced
as a secondary operation as the course developed, and suitable laboratory
expe
riments
would also be arranged to fit the lecture material. Accordingly, a rough
outline of the course was established, but this was recognized as being
incomp
lete,
tentative, and subject to considerable modification by whoever was to bear
the
responsibility for actually preparing the lectures.
Concerning the mechanism by which the course would finally be brought to
life, several plans were considered. These plans were mostly rather
similar, i
nvolving
a cooperative effort by N staff members who would share the total burden
symmetrically and equally: each man would take responsibility for 1/N of the
material, deliver the lectures, and write text material for his part.
However,
the
unavailability of sufficient staff, and the difficulty of maintaining a
unifor
m point
of view because of differences in personality and philosophy of individual
par
ticipants,
made such plans seem unworkable.
The realization that we actually possessed the means to create not just a
new
and different physics course, but possibly a unique one, came as a happy
inspi
ration
to Professor Sands. He suggested that Professor R. P. Feynman prepare and
deliver the lectures, and that these be tape-recorded. When transcribed and
ed
ited,
they would then become the textbook for the new course. This is essentially
th
e
plan that was adopted.
It was expected that the necessary editing would be minor, mainly
consisting o
f
supplying figures, and checking punctuation and grammar; it was to be done
by
one or two graduate students on a part-time basis. Unfortunately, this
expecta
tion
was short-lived. It was, in fact, a major editorial operation to transform
the
verbatim
transcript into readable form, even without the reorganization or revision
of The subject matter that was sometimes required. Furthermore, it was not a
job for a technical editor or for a graduate student, but one that required
th
e close
attention of a professional physicist for from ten to twenty hours per
lecture
!
The difficulty of the editorial task, together with the need to place the
mate
rial
in the hands of the students as soon as possible, set a strict limit upon
the
amount
of "polishing" of the material that could be accomplished, and thus we were
forced to aim toward a preliminary but technically correct product that
could
be
used immediately, rather than one that might be considered final or
finished.
Because of an urgent need for more copies for our students, and a
heartening i
nterest
on the part of instructors and students at several other institutions, we
deci
ded
to publish the material in its preliminary form rather than wait for a
further
major
revision which might never occur. We have no illusions as to the
completeness,
smoothness, or logical organization of the material; in fact, we plan
several
minor
modifications in the course in the immediate future, and we hope that it
will
not
become static in form or content.
In addition to the lectures, which constitute a centrally important part of
th
e
course, it was necessary also to provide suitable exercises to develop the
stu
dents'
experience and ability, and suitable experiments to provide first-hand
contact
with the lecture material in the laboratory. Neither of these aspects is in
as
advanced
a state as the lecture material, but considerable progress has been made.
Some exercises were made up as the lectures progressed, and these were
expande
d
and amplified for use in the following year. However, because we are not yet
satisfied that the exercises provide sufficient variety and depth of
applicati
on of
the lecture material to make the student fully aware of the tremendous power
being placed at his disposal, the exercises are published separately in a
less
permanent
form in order to encourage frequent revision.
A number of new experiments for the new course have been devised by
Professor
H. V. Neher. Among these are several which utilize the extremely low
friction
exhibited by a gas bearing: a novel linear air trough, with which
quantitative
measurements of one-dimensional motion, impacts, and harmonic motion can be
made, and an air-supported, air-driven Maxwell top, with which accelerated
rot
ational
motion and gyroscopic precession and nutation can be studied. The
development
of new laboratory experiments is expected to continue for a considerable
period of time.
The revision program was under the direction of Professors R. B. Leighton,
H. V. Neher, and M. Sands. Officially participating in the program were
Profes
sors
R. P. Feynman, G. Neugebauer, R. M. Sutton, H. P. Stabler,* F. Strong, and
R. Vogt, from the division of Physics, Mathematics and Astronomy, and
Professo
rs
T. Caughey, M. Plesset, and C. H. Wilts from the division of Engineering
Scien
ce.
The valuable assistance of all those contributing to the revision program
is g
ratefully
acknowledged. We are particularly indebted to the Ford Foundation, without
whose financial assistance this program could not have been carried out.
ROBERT B. LEIGHTON
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※ 修改:·Rg 於 08月15日12:08:01 修改本文·[FROM: nlo.hit.edu.cn]
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