galileo galilei (1564-1642) and his theory of motion prof. alexander hahn
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Galileo Galilei (1564-1642) and his Theory of Motion
Prof. Alexander Hahn
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A New Opera
“Galileo Galilei” by Philip Glass http://www.bam.org/asp/performance.asp?
perfID=GalileoGalilei
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New Scholarship
Galileo in Context Edited by Jürgen Renn © 2002 Cambridge University press
From the NY Times
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A Wonderful Book
Galileo’s Daughter Dava Sobel ©2000 Penguin
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The Recent ND Conference
Galileo and the Church www.nd.edu/~hps/galileo.html
Combined with performances of Brecht's “Life of Galileo” www.nd.edu/~isla/ISLA/webpages/thearts
/FTT/calendar/galileo.htm
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Galileo and his Time
http://es.rice.edu/ES/humsoc/Galileo/
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Galileo's Science
The Basic Question:How do things move?
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Basic Question #1
How do the planets move? Answers before Galileo
Ptolemy (200 AD) Geocentric epicycles (example of epicycle Sun-Earth-Moon).
Copernicus (1473-1543) Heliocentric circles and epicycles.
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Galileo's Contributions
What is actually happening? The telescope: Moon, Venus, Jupiter. Vocal supporter of Copernicus Dialogue Concerning the Two Chief
World Systems, 1632. Problems with the Church
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This Morning: Basic Question #2
How do thrown objects (projectiles) move? The balls that we observe every day in lots
of different sports? Answers before Galileo
Aristotle's Physics: Heavy objects fall more quickly.
The notion of Impetus.
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Galileo's Contributions
What is actually happening? Breaking the mold. A new theory and an experiment. Discourse about Two New Sciences,
1638.
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Galileo's Theory of Motion
round bronze ball
inclined plane
table (about 30.5 inches high)
floor
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d is proportional to h
shorthand: d h
Means:
d’ h’ d h
=
d
d’h’
h
The Meaning of Proportion
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Start a ball from rest anywhere and let it roll
Let h be the height atthe start andlet t be the time it takesto reach the bottom
Let v be its velocity or speed at the bottom andlet d be the distance that the ball has travelled
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Then v t and d t 2.
Therefore, d v
2
But also, d h. So h v 2.
Therefore, v
€
h
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Vertical Component:free fall from restwill take the same time t0 to reach the groundno matter what v is
Horizontal Component:continues withvelocity v
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R = v x t0 and therefore, R vBecause v , we finally get
R .
€
h
€
h
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Galileo tests this Relationship with an Experiment
A page of Galileo's Working Notes http://www.mpiwg
-berlin.mpg.de/Galileo Prototype/index.htm
Confirmation by Experiment
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Galileo Galilei (1564-1642) and his Theory of Motion
Prof. Alexander Hahn
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