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Gravitation attraction of inner portion problem

  1. Apr 29, 2015 #1
    1. The problem statement, all variables and given/known data
    While solving a question on gravitation I had to consider a very thin spherical layer of a uniformly dense sphere. It's written in the solution that :
    "Then the considered layer is attracted to the part of the sphere lying within it (outer part doesn't act on the layer)

    2. Relevant equations


    3. The attempt at a solution
    I have problem in the bold part. Why wont the upper part not attract the layer? Why only the inner layer will do so?
     
  2. jcsd
  3. Apr 29, 2015 #2

    Doc Al

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    Staff: Mentor

    Look up Newton's Shell theorems.
     
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