Orbits and satellites key info Flashcards
So i will be able to know the definition of these key terms and I will be able to recall different types of satellites
What are the planets?
these are large objects that orbit a star.
List all of the identified objects in our solar system!
Mercury Venus Earth Mars Asteroid Belt Jupiter Uranus Neptune Keiper Belt
What are dwarf planets?
These are planet-like objects that orbit stars but don’t meet all of the rules for being a planet.
What do moons do and what are they?
Moons orbit planets and are a type of satellite.
What are artificial satellites?
Are satellites that humans have built. They generally orbit the Earth
Name one special aspect of Mercury
The closest planet to the sun
Name one special aspect of Venus
Unbroken layer of sulfuric acid
Name one special aspect about Earth
Water can be gas, liquid, solid
Name one special aspect of Mars
The largest volcano in the solar system
What is special about Jupiter
The largest planet in our solar system
Name the ice giants
Jupiter, Saturn, Uranus, Neptune
Name the inner plants
Mercury, Venus, Earth, Mars
What is the centripetal force
Acts towards the centre of orbit
Where are Geostationary satellites placed?
They are always placed in the same place in the sky.
What are some examples of geostationary satellites?
Communication satellites and weather satellites
How does the red-shift support the big bang theory
6 marks
Red-shift is when the wavelengths of observed light from a source are longer than that of the light emitted by the source.
This occurs when the source of light is moving away from the observer.
The light from galaxies that are further away from us is red-shifted more than the light from nearer galaxies.
This suggests that the universe is expanding.
Therefore galaxies are moving further away from us and each other.
The Big Bang theory is the theory that the universe began as a small region of space that was very hot and dense, which exploded and has been expanding ever since.
Why do we not think that old galaxies die and new galaxies replace them?
Cosmic Microwave Background Radiation.
What are the limitations of using the balloon to represent galaxies?
There is only so much you can inflate the balloon.
Why are telescopes that detect different types of electromagnetic waves used to observe the universe?
Galaxies emit different types of em waves.
Explain why acceleration changes the planet’s velocity but not its speed
The acceleration acts along the radius of the orbit, towards the centre.
This means it acts at right angles to the planet’s speed.
Acceleration that is perpendicular to the direction of motion does not affect the speed of the motion, it just changes the direction.
Therefore, the speed of the planet is not changed by the acceleration.
Velocity is a vector quantity, with magnitude and direction.
the planet’s velocity is constantly changing because its direction is constantly changing.
Circular motion means that the planet to move on a circular path.
What does constantly changing direction mean?
It is constantly accelerating
Fill in the gaps
The object keeps ___________ towards what it’s orbiting but the ___________ _________ (which is at a right angle to the acceleration) kepps it travelling in a _____.
keeps, accelerating, instantaneous velocity, circle
What is at a right angle to the acceleration of an orbit?
Instantaneous velocity.
What force is directed towards the centre of the circle?
Centripetal force
The ________ force would cause the object to ___ towards whatever it was orbiting, but as the object is already moving it just causes it to change _______
centripetal,fall,direction
If an object is travelling in a circle it is constantly ______ _______ ,which means it is constantly accelerating.
changing direction
Acceleration
The rate of the velocity
