P5a: Satellites, Gravity & Circular Motion

Satellites: Object that ORBITS a LARGER object in Space
1. NATURAL: Natural object (Moon)
2. ARTIFICIAL: Man-made object (satellite tv)
  1. Geostationary
    1. Orbit Time- 24hrs
    2. 36000km above equator
      1. Fixed position
    3. If satellites are placed too close together signals will overlap
      1. DIFFRACTION
    4. TV/ Phone/ GPS/ scientific research/ long term weather forecasting
  2. Low Polar
    1. 100km above surface
      1. Above poles
    2. Faster
      1. Orbit Time- 90mins
    3. 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
1. Planets closer to the Sun have shorter orbit times
  1. Gravity makes a satellite accelerate towards Earth
    1. Circular orbit: moves at a tangent-Earth is curved
  2. Travel faster-bigger gravitational pull
  3. Don't travel as far
Comets
1. ELLIPTICAL ORBIT
2. Closer to the Sun- gravitational force is STRONGER- FASTER
3. Further from the Sun- gravitational force is WEAKER- SLOWER
FURTHER away MASSES have a SMALLER GRAVITATIONAL FORCE
1. F=1 d

Resource summary

	Created by zoey3569 about 10 years ago