Bernoulli's equation derivation

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SUMMARY

The derivation of Bernoulli's equation utilizes the Work Energy Theorem, which states that the work done on a fluid is equal to the change in kinetic energy plus the change in potential energy. In this context, the work done by non-conservative forces is represented as the change in kinetic energy, while the work done by conservative forces, such as gravity, is linked to the change in potential energy. The discussion clarifies that both interpretations of the Work Energy Theorem are correct when applied to different forces acting on the fluid in motion.

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Homework Statement



In bernoulli's equation derivation, we use Work energy theorem, in which work done is taken as change in kinetic energy plus change in potential energy.
But in mechanics, i have studied, Work energy theorem is simply change in kinetic energy.
So, which is correct? Pls help revered members

Homework Equations





The Attempt at a Solution


 
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The work Energy Theorem states that the change of KE is equal to the work of all forces. If one of the forces is conservative, the work of that force is equal to the negative potential energy change. If you have two forces, Fa and Fb, and Fb is conservative, with PE(b) potential energy,

ΔKE=W(a)+W(b)=W(a) -ΔPE(b), that is W(a)= ΔKE+ΔPE(b)

When deriving Bernoulli's equation, one force comes from the pressure at the cross-sections of the tube containing the fluid. The other force is gravity.

ehild
 
Thanks Mr.ehild for your beautiful explanation.
 

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