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What is the definition of net upward force?

  1. Aug 22, 2015 #1
    To keep the can immersed, an external downward force is needed to balance the net upward force(=F'b-W).
  2. jcsd
  3. Aug 22, 2015 #2
    You may want to expand on your question.
  4. Aug 23, 2015 #3
    F'b means maximum upthrust.
  5. Aug 23, 2015 #4


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    The expression "net force in direction x" means the sum of all forces, or components of forces, that act in direction x. If the sum of forces acting in the x direction is zero then the object isn't accelerating in the x direction.
  6. Aug 23, 2015 #5
    F'b is the buoyant force (due to hydrodynamic pressure) on the can, and W is the weight of the can and its contents. The "net upward force" as used in the present context is the buoyant force minus the weight.

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