What is the definition of net upward force?

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SUMMARY

The net upward force is defined as the difference between the buoyant force (F'b) and the weight (W) of an object, expressed mathematically as net upward force = F'b - W. To keep an object, such as a can, immersed in a fluid, an external downward force is required to counterbalance this net upward force. The buoyant force arises from hydrodynamic pressure acting on the submerged object. If the sum of forces in the vertical direction equals zero, the object remains in equilibrium and does not accelerate vertically.

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Palak Verma
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To keep the can immersed, an external downward force is needed to balance the net upward force(=F'b-W).
 
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You may want to expand on your question.
 
F'b means maximum upthrust.
 
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.
 
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Palak Verma said:
To keep the can immersed, an external downward force is needed to balance the net upward force(=F'b-W).
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.

Chet
 
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