Further Physics - Gravity and Planetary Orbits 1

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GRAVITY is CENTRIPETAL FORCE that keeps planets in orbit

GRAVITY is the force of attraction between masses - larger the masses, greater the forces of attraction between them 

GRAVITATIONAL FORCE can act as CENTRIPETAL FORCE that keeps on object in orbit around another - orbit is possible when there is a balance between the forward motion of the object and the gravitational force pulling it inwards.

  • Planets always orbit around stars - stars provide centripetal force
  • Orbits around Sun always slightly ELIPTICAL
  • Further planet is from the Sun, longer the…


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