Re: [Phys-l] possible projectile lab

[Jack Uretsky <jlu@hep.anl.gov>]

Hi all-
	I tried repeating Galileo's experiment in a lab at College of 
DuPage, about 10 years ago.  The problem was to find a sufficiencly smooth 
plank of wood to use as an inclined plane.  We never had an acceptable 
reproduction of Galileo's result.
				Regards,
					Jack

"Trust me.  I have a lot of experience at this."
		General Custer's unremembered message to his men,
		just before leading them into the Little Big Horn Valley




On Thu, 17 Dec 2009, Bernard Cleyet wrote:

> In the Florence museum:
>
> http://brunelleschi.imss.fi.it/museum/esim.asp?c=404013
>
> Not a duplicate of the original.
>
> bc been there saw that, and his finger.
>
>
>
>
> On 2009, Dec 16, , at 20:47, Gary Karshner wrote:
>
> > Dwight,
> >     This is a real classic in the sense that Galileo used it to study
> > accelerated motion. He found the distance covered by the marble down
> > an
> > inclined plane varied as the square of the time. He measured the time
> > intervals by using a series of frets that the marble would pass over
> > with a
> > bump or ticking sound. He arranged the frets so the ticking was on the
> > musical beat thus placed at equal time intervals. Stillman Drake in
> > his book
> > "Galileo at work" repeated the experiments from Galileo's notes. He
> > also
> > wrote an article in Scientific American describing this work, in the
> > 1970's
> > I think.
> >      Galileo then goes on to calculate where the marble will land,
> > and that
> > then end of his experiments on falling bodies. The kicker is that
> > the marble
> > doesn't land where he expects because of the kinetic energy stored
> > in the
> > rolling ball. He used the motion down the plane to determine the
> > acceleration of gravity.
> >      So your experiment is true a classic one. good luck with it.
> > Gary
> > _______________________________________________
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>
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