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Transcript of Physics
First to measure time accuratley by using the swing of a pendulum as a unit of time
Planets in the system vary in
brightness because they are
different distances from Earth.
Development throughout the scientific revolution
Best known for his 3 laws of motion
Sir Isaac Newton
1st Law- Inertia
Things at rest tend to stay at rest; things in motion tend to stay in motion
2nd Law: F=ma
3rd law: Action and Reaction
The rate of change of momentum of an object is directly proportional to the resultant force acting on it.
Every action has an equal and opposite reaction
Born in Pisa Italy, attended University of Pisa for Medicine.
Galileo used free-fall experiments to explore the connection between weight and the accleration of gravity.
Found that regardless of mass, all objects fall at the same rate.
"The Copernican Model: A Sun-Centered Solar System." The Copernican Model: A Sun-Centered Solar System. Web. 23 Oct. 2013.
"Galileo’s Law of Planetary Motion." Galileo’s Law of Planetary Motion. Web. 23 Oct. 2013. <http://www.mathpages.com/home/kmath568/kmath568.htm>.
"Johannes Kepler: The Laws of Planetary Motion." Johannes Kepler: The Laws of Planetary Motion. Web. 23 Oct. 2013. <http://csep10.phys.utk.edu/astr161/lect/history/kepler.html>.
Machamer, Peter, Machamer,. "Galileo Galilei." Stanford University. Stanford University, 04 Mar. 2005. Web. 23 Oct. 2013.
Miller, Cole. "Astronomy 100." Astronomy Courses. University of Maryland. Web. <http://www.astro.umd.edu/~miller/ASTR100/class6.pdf>.
"Newtons Laws." Science Channel. Discovery Communications. Web. 23 Oct. 2013.
Sir Isaac Newton, The Illustrated Magazine of Art, Vol. 2, No. 11 (1853), pp. 293-295
Wilde, Megan. "The Galileo Project | Biography | Home." The Galileo Project | Biography | Home. Rice University. Web. 23 Oct. 2013.
Kepler's 3 Laws of Planetary Motion
The planetary orbits around the sun take shape of an ellipses, with the sun at one focus point.
The line joining the planet to the Sun sweeps out equal areas in equal times as the planet travels around the ellipse.
The ratio of the squares of the revolutionary periods for two planets is equal to the ratio of the cubes of their semimajor axes:
Galileo's Big Ideas
As Galileo studied the orbit of the planets he ignored the laws discovered by Johannes Kepler
Galileo proved the Copernican theory on a heliocentric solar system by observing the phases of Venus
This solidified the Copernican system by disproving the Aristotelian view where the sun and other planets orbit the earth
The heliocentric system- A sun centered solar system
"a Sun centered solar system"
Galileo also explored the idea that the velocity of an object in free-fall increases the longer it falls
From this experiment he was able to exlore the constant acceleration that is GRAVITY
Planets moved in a uniform circular motion
The widely believed idea before the modern laws of planetary motion was the Aristotelian system, which was the idea that everything rotates around the earth.
- could not explain the details of planetary motion on a celestial sphere with out epicycles
It was at U of Pisa that Galileo first observed the swinging lamp that started his research into pendulums.
Hired as a mathematician at University of Padua
Had two children with Marina Gamba
Worked with his reflective telescope while at Padua
Began working as the Mathematician and Philosopher for the Grand Duke of Tuscany.
Galileo and the Church
In 1613 he published Letters on the Sunspots. First time he showed his support of Copernicus.
Begin work on his Dialogues concerning the Two Great World Systems because the pope was his friend
Convicted of heresy, and sentenced with house arrest
Died in house arrest January 8, 1642
Used combination of gravity and Newton's second law to prove relationships dealing with force
Dropped stones of the same mass onto stakes from different heights and then measured height of stake
He saw that as objects were dropped from higher heights, then the force was greater
Big Ideas Cont.
Modification of Aristotlian ideas
Motion - Horizonal Surface
Speed of Light