Galileo

Sun Centered Solar System Not Earth Centered https://ca.pbslearningmedia.org/resource/ess05.sci.ess.eiu.galileosys/galileo-sun-centered-system/#.WRnrCmjyuUk

Why can't we feel the spin of the Earth or it's effects. Cannon Ball Drop from moving horse. []

Galileo uses ramps and discovers the math behind falling objects []

What Galileo saw with his telescope https://www.youtube.com/watch?v=bCIEYUeXll8

Galileo mentioned on the Moon https://www.youtube.com/watch?v=5C5_dOEyAfk http://www.teachertube.com/video/hammer-and-feather-drop-on-moon-41342

http://www.pbs.org/wgbh/nova/earth/galileo-big-mistake.html https://ca.pbslearningmedia.org/resource/50965499-famous-philosophers/galileo-galilei-famous-philosophers/#.WRoz8mgrKUk

http://www.pbs.org/wgbh/nova/tech/inventing-telescopes.html

Videos [|Galileo: A Different Thinker] https://ca.pbslearningmedia.org/resource/phy03.sci.phys.mfw.lp_galileo/

[|The Beginnings of the Telescope] https://ca.pbslearningmedia.org/resource/phy03.sci.engin.design.galileotele/

[|Galileo's Telescope] https://ca.pbslearningmedia.org/resource/phy03.sci.phys.energy.galileotele2/

[|Galileo: Sun-Centered System] https://ca.pbslearningmedia.org/resource/ess05.sci.ess.eiu.galileosys/

[|Galileo: His Experiments] https://ca.pbslearningmedia.org/resource/phy03.sci.phys.mfw.galileoexp/

[|Galileo: Incline Plane]

https://ca.pbslearningmedia.org/resource/phy03.sci.phys.mfw.galileoplane/galileos-inclined-plane/#.WRo0-GgrKUk

[|Galileo: Sunspots] https://ca.pbslearningmedia.org/resource/ess05.sci.ess.eiu.galileosun/

[|Galileo: Timeline of His Life] https://ca.pbslearningmedia.org/resource/phy03.sci.phys.mfw.galileolife/

http://www.pbs.org/wgbh/nova/tech/inventing-telescopes.html

http://sciencefair.math.iit.edu/projects/galileo/

In the early seventeenth century, Galileo makes a claim (or hypothesis) concerning the natural motion (“natural motion” is

Aristotelian language) of a freely falling body. Galileo claimed that a naturally falling object will gain equal amounts of velocity in equal amounts of time. If correct, this means that i) the object’s speed increases as it falls and ii) the rate at which it picks up speed does not change during the fall. However, practical problems make it difficult for Galileo to put such a claim to any experimental test. Freely falling objects

move too quickly to study or record the motion directly. Because seventeenth century clocks could not record the short times

involved, Galileo tried to slow down the motion by replacing the falling object with a ball rolling down a gently inclined plane. "In order to make use of motions as slow as possible ... I also thought of making moveables descend along an inclined plane

not much raised above the horizontal" (Galileo, Two New Sciences, p. 87).

Notice that Galileo guessed (or assumed) that objects descending an incline speed up in exactly the same way falling

objects do! Essentially, he reasoned as follows. A ball rolling down a steep incline will pick up speed faster than a ball

rolling down a gentle incline, but the way in which its speed increases will be the same. Freefall, he reasoned, is simply equivalent to a vertical ramp. The character of the ball’s motion in freefall should be the same as the character of the motion of a ball “falling” down the inclined plane. Another technological problem arose in measuring the velocity. If Galileo’s hypothesis is right, the velocity of the freely falling object changes continuously. Galileo cannot measure changing velocities directly, but he can measure distances and times. Galileo, therefore, uses math to transform his claim about times and velocities into a claim about times and distances. His mathematical argument is summarized below:

If an object gains speed at a steady rate and

if the object is released from rest,

then the total distance traveled by the object will be proportional to the square of the time needed for that travel.