Geocentric v Heliocentric Models
What does geocentric mean?
Earth in the center
Who invented the first telescope?
Galileo
An eccentricity of 0 would have what shape?
Perfect circle
What is the gravitational constant?
6.67x10-11
How many laws of Planetary Motion are there?
Three
Who created the original Geocentric Model?
Eudoxus
What was the initial reaction to Copernicus's Heliocentric Model?
Rejected by the church and people
An eccentricity of 1 would have what shape?
What unit is Force measured in?
Newtons (N)
What is the 1st Law of Planetary Motion?
All planets orbit in ellipses
What did Ptolemy change in his Geocentric Model?
Orbit shape: epicycles
Why did Ptolemy make his orbits epicycles?
To explain what we know as retrograde
Which orbit is less elliptical?
A- 0.6
B- 0.3
B - 0.3
Solve for force:
m1 = 300 kg
m2 = 4000 kg
r= 12900 m
4.8 x 10-13 N
What is Kepler's 2nd Law of Planetary Motion?
Objects will change speed to cover equal area in equal time
How is Kepler's Heliocentric Model different from Copernicus' Heliocentric Model?
Orbits are ellipses
What was the evidence that Galileo found with his telescope that helped people believe in Copernicus's model?
Venus has phases, Jupiter has moon
Draw an orbit that has an eccentricity of 0.7
Answer may vary
Solve for force:
m1= 4.3 x 1012 kg
m2= 4700 kg
r= 3.5 x 108 m
1.1 x 10-11 N
How long was the original Geocentric Model accepted and used?
1500 years
Where was Copernicus born? (country)
Poland
Order these from most to least elliptical: 0.07, 0.7, 0.2, 0.05
0.7, 0.2, 0.07, 0.05
Solve for force:
m1 = 2.9 x 1013 kg
m2= 8.3 x 107 kg
r = 6.7 x 107 m
3.6 x 10-5 N
What is Kepler's 3rd Law of Planetary Motion?
The further the object the longer its orbit, the closer the object the shorter the orbit