Orbits And Gravity Flashcards
What is a celestial pole
Idea that all celestial objects appear to rotate around a fixed point
Ptolemy geocentric model
All celestial objects rotate around the Earth in giant spheres
What is the geocentric model
No evidence for parallax, earth is the center of the universe
What did Copernicus say
The sun is the center of the universe and earth revolves around it well also rotating every day
What did Kepler say
Orbits are actually ellipses not circles
What did Galileo say
Geocentric model is wrong, Jupiter has moons
Who came up with the geocentric model
Claudius Ptolemy
Who came up with heliocentric model
Copernicus, Kepler, Galileo
Keplers first law
Orbits are ellipses
Keplers 2nd law
Ellipses sweep equal areas in equal times
Keplers 3rd law
The square of the period is proportional to the cube of the semi major axis
Newton’s first law of motion
An object in mention tends to stay in motion, an object at rest tends to stay at rest
Newtons 2nd law of motion
Force = mass x acceleration
Newtons 3rd law
Every action has an equal opposite reaction
What is mass
Mass is a measure of the amount of stuff inside something
