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Re: [Phys-l] nifty pendulum, conservation, et cetera



p. 320 2nd ed. of your favo.:

"He (G. G.) asserted that '... any velocity once imparted to a body will be rigidly maintained as long as there are no causes of acceleration or retardation, a condition which is approached only on horizontal planes where the force of friction has been minimized.'"

Wow! Better than I thought.

Note: The PSSC people are quite emphatic on the subject of cause and effect WRT 2nd law.

bc, collector of old texts and doesn't understand the pain.

p.s. Hijack apologize? You joke.

p.p.s. Hewitt asks (6th ed. p. 16) would it be correct to say that inertia (GG's neologism) causes a moving object to continue in motion? Short answer: no.
Bob LaMontagne wrote:

A marble in the bowel? That had to hurt :-)

I don't mean to hijack this thread, but I remember the old Physical Science
text by Holton making a big distinction between N1 and Galileo's Law of
Inertia. As I remember, Galileo claimed that as long as a rolling object did
not change it's distance from the center of the Earth it would not speed up
or slow down. N1 applies to true straight line motion.

Unfortunately, I have lost my copy of Holton over the years - but when
Physical Science was in favor it was my favorite text.

Bob at PC


-----Original Message-----
From: phys-l-bounces@carnot.physics.buffalo.edu [mailto:phys-l-
bounces@carnot.physics.buffalo.edu] On Behalf Of Bernard Cleyet
Sent: Wednesday, May 31, 2006 10:56 PM
To: Forum for Physics Educators
Subject: Re: [Phys-l] nifty pendulum, conservation, et cetera

Didn't he try a "marble" ina bowel first?

bc, who objects to the "nearly-lossless" phrase, and calls N's 1st,
Galileo's law.

p.s. A UCSC faculty member, ca. 1986, requested one of these. Re: JD's
observation #2; I think T.S. Kuhn explains some of this.

John Denker wrote:




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