P5 - Gravity and Satellites Flashcards
Why are microwaves used for satellite communication?
Because they can pass through the ionosphere more easily to reach the satellites in orbit.
How is an orbit balanced?
The forward motion and the force pulling inwards are equal (centripetal force)
What does gravity do to objects?
Makes them accelerate towards the earth
What is the equation for gravitational field strength?
Weight/Mass=Gravitational Field Strength
What is a satellite?
An object which orbits around a larger object in space
Why are geostationary orbits ideal for communication?
They stay at the same point above the earth
How long does it take for a communications satellite to orbit the earth once?
24 hours
What is the name for a satellite which stays at the same point above earth?
Geostationary
Why are weather satellites good for taking pictures of the earth?
They are very close to the earth
Which has a higher frequency, radio or microwaves?
Microwaves
