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Sinking rock

  1. Jan 11, 2014 #1
    If a rock is sinking in water with constant speed..

    how many forces are working on it?
  2. jcsd
  3. Jan 11, 2014 #2


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    Staff: Mentor

    What are *your* thoughts? What is the context of your question?
  4. Jan 12, 2014 #3
    my thoughts are that there are only two; gravity and water resistance, but my physics book says its three; gravity, water resistance AND buoyancy. i don't understand how buoyancy works in this situation... anyone?
  5. Jan 12, 2014 #4


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    Science Advisor

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