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Understanding the concept of the effects on an orbit

  1. Feb 3, 2007 #1
    I am having trouble understanding the concept of the effects on an orbit. The question asks if we replaced the sun with a rock of the same mass, would Earth's orbit change? I think it doesn't because orbits don't change because of its orbital energy. but i'm not sure because i wonder if the kinetic and gravitational energy would change and thus affect the orbit?
     
  2. jcsd
  3. Feb 3, 2007 #2

    Dick

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    What effect keeps the earth in orbit?
     
  4. Feb 3, 2007 #3
    i thought orbital energy keeps it in orbit
     
  5. Feb 3, 2007 #4

    Dick

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    Wrong. A force keeps it in orbit. Not an energy. Which force?
     
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