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491565
P5a: Satellites, Gravity & Circular Motion
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OCR Gateway- B
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gcse
physics
physics
gcse
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zoey3569
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zoey3569
over 10 years ago
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Resource summary
P5a: Satellites, Gravity & Circular Motion
Satellites: Object that ORBITS a LARGER object in Space
NATURAL: Natural object (Moon)
ARTIFICIAL: Man-made object (satellite tv)
Geostationary
Orbit Time- 24hrs
36000km above equator
Fixed position
If satellites are placed too close together signals will overlap
DIFFRACTION
TV/ Phone/ GPS/ scientific research/ long term weather forecasting
Low Polar
100km above surface
Above poles
Faster
Orbit Time- 90mins
Military spying/ detailed pictures of Earth's surface/ short term weather forecasting
GRAVITY keeps Moon in ORBIT AROUND Earth
ALL object in the Universe ATTRACT EVERY OTHER object
LARGE MASSES give LARGER GRAVITATIONAL FORCE: Sun to Plantes
time= distance = 2 r speed speed
Centripetal Force: FORCE needed to keep object in a CIRCULAR PATH
Planets closer to the Sun have shorter orbit times
Gravity makes a satellite accelerate towards Earth
Circular orbit: moves at a tangent-Earth is curved
Travel faster-bigger gravitational pull
Don't travel as far
Comets
ELLIPTICAL ORBIT
Closer to the Sun- gravitational force is STRONGER- FASTER
Further from the Sun- gravitational force is WEAKER- SLOWER
FURTHER away MASSES have a SMALLER GRAVITATIONAL FORCE
F=1 d
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