GCSE Physics Unit 3 Revision (4)

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Gravity and Planetary Orbits

  • Gravity is the centripetal force that keeps planets in orbit
  • Gravity is the force of attraction between masses - the larger the masses the greater the forces of gravity between them.
  • The gravitational force acts as the centripetal force which keeps one object orbiting another. 
  • An orbit is possible when there is a balance between the motion of the object and the gravity pulling it inwards.
  • Planets orbit stars in elliptical (slightly squashed) circles. 
  • The further the planet is from the Sun, the longer it takes…


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