P5

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  • Space
    • Satellites
      • ?
        • An object which orbits a larger object in space
      • Types
        • Man-made (Artificial)
          • Geostationary orbit
            • 36000km above the equator
            • 24hours to orbit. Appears to be in the same position
            • Communications
            • Cannot be close together as their signals would overlap due to diffraction
          • time                  = Distance/speed=                     2x pie r /speed
        • Natural
      • The higher the satellite, the longer it takes to orbit
      • Moves at a tangent and gravity makes it accelerate towards earth
    • Gravitational Forces
      • The large the mass, the greater the gravitational force
      • The further away the object, the smaller the gravitational force
      • Universe square law:       force § 1/distance
      • Orbit around sun shorter for planets closer
        • Planet travels a shorter distance
        • Travels faster, greater gravitational force
    • Gravity
      • All objects attract each other
      • Planets stay in orbit around the sun due to gravitational attraction
        • Gravitational Forces
          • The large the mass, the greater the gravitational force
          • The further away the object, the smaller the gravitational force
          • Universe square law:       force § 1/distance
          • Orbit around sun shorter for planets closer
            • Planet travels a shorter distance
            • Travels faster, greater gravitational force
      • Object moving in a circle needs a force towards the centre of the circle: CENTRIPETAL FORCE

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