Physics Flashcards
(19 cards)
Geocentric Model
Was a model of space that showed Earth as being at the centre while other planets orbited around it.
Heliocentric Model
Was a model of space that showed the Sun as being at the centre of our solar system while all the other planets orbited it.
What led Galileo to believe in Heliocentrism?
He saw that Venus had phases like the moon and other planets had their own moons which could not be explained through Geocentricism.
What are some similarities between both the Geocentric and Heliocentric Models?
- They both state that the other planets orbit something
- They both included retrograde motion
- They both include the suggestion of stars beyond our solar system (Sphere of fixed Stars)
What are some differences between the Geocentric and Heliocentric Models?
- The Geocentric Model suggests the Earth is the Centre of both our solar system and the whole of the Universe
- The Heliocentric Model shows that other planets have stars
-The Geocentric Model shows that all the planets move in small circles as they orbit the Earth
Why were atoms not able to form immediately after the Big Bang?
Because the Surrounding area was too hot for any atoms to survive
What is the Theory of how the universe started called?
Big Bang Theory
What is meant by the Big Bang?
It relates to the theory that our universe started as an infinitely hot and very small spot which then built up pressure and eventually exploded and then slowly expanded our Universe over time.
What are some ways that the Big Bang theory is supported by evidence?
- Our Universe is still expanding
- BlueShift and Redshift (which is shorter and longer frequency wavelengths of something that is seen)
What are the different types of Orbits a Satellite can take?
- Geostationary
- Low Earth Orbit (LEO)
- Polar Orbit
How do you get a Geostationary Satellite into Orbit?
- Must be Orbiting above the Equator
- Has to be 36.000 km away from Earth to stay in the same place
How do you get a Low Earth Orbit Satellite into Orbit?
- Can be above anywhere
- In orbit below 1000km from Earth
How do you get Polar Orbit Satellite into Orbit?
- Low orbit around the Earth passing over both the Poles
- Earth rotates underneath them as they orbit
What are some uses of Satellites?
- Telecommunications
- Communication
- GPS and Mapping
- Studying the Earth
- Weather
- TV and Radio Signals
State some Benefits of the Space Programme
- Liquid Cooling Suits
- Shock Absorption Material
- Baby Milk Formulas
- Computer Programs for credit card Swiping
- Water Filters
State some Risks of the Space Programme
- Spacecraft could be faulty and harm those in it or others on land
- The Rocket is very Expensive
What are Telescopes made for?
They were made for seeing objects in more detail and larger size that are far away
What are the 2 Types of Telescopes?
- Reflecting Telescope
- Refracting Telescope
What are the differences between the 2 Telescopes
The Reflecting Telescope uses a Concave Mirror to reflect the image onto a slanted mirror that displays the image through the eyepiece whereas the Refracting Telescope uses an objective lens
