P5a: Satellites, Gravity & Circular Motion

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zoey3569
Created by zoey3569 almost 6 years ago
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P5a: Satellites, Gravity & Circular Motion
1 Satellites: Object that ORBITS a LARGER object in Space
1.1 NATURAL: Natural object (Moon)
1.2 ARTIFICIAL: Man-made object (satellite tv)
1.2.1 Geostationary
1.2.1.1 Orbit Time- 24hrs
1.2.1.2 36000km above equator
1.2.1.2.1 Fixed position
1.2.1.3 If satellites are placed too close together signals will overlap
1.2.1.3.1 DIFFRACTION
1.2.1.4 TV/ Phone/ GPS/ scientific research/ long term weather forecasting
1.2.2 Low Polar
1.2.2.1 100km above surface
1.2.2.1.1 Above poles
1.2.2.2 Faster
1.2.2.2.1 Orbit Time- 90mins
1.2.2.3 Military spying/ detailed pictures of Earth's surface/ short term weather forecasting
2 GRAVITY keeps Moon in ORBIT AROUND Earth
3 ALL object in the Universe ATTRACT EVERY OTHER object
4 LARGE MASSES give LARGER GRAVITATIONAL FORCE: Sun to Plantes
5 time= distance = 2 r speed speed
6 Centripetal Force: FORCE needed to keep object in a CIRCULAR PATH
6.1 Planets closer to the Sun have shorter orbit times
6.1.1 Gravity makes a satellite accelerate towards Earth
6.1.1.1 Circular orbit: moves at a tangent-Earth is curved
6.1.2 Travel faster-bigger gravitational pull
6.1.3 Don't travel as far
7 Comets
7.1 ELLIPTICAL ORBIT
7.2 Closer to the Sun- gravitational force is STRONGER- FASTER
7.3 Further from the Sun- gravitational force is WEAKER- SLOWER
8 FURTHER away MASSES have a SMALLER GRAVITATIONAL FORCE
8.1 F=1 d

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