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Work Energy Theorem 
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#1
Jan413, 10:18 AM

P: 19

Plz tell me
Which is correct form of Work Energy theorem 1. Total Work = Toatl change in Mechanical Energy(Potental + Kinetic) 2. Total Work + Potential Energy = Total Change in Kinetic Energy 3. Total Work = Total Change in Kinetic Energy (Mention in the text books) Actually i am confused when i prove Bernoulli Theorem for fluid. Some writers use Total Work done(Due to pressure) + Change in Potential Energy = Change in Kinetic Energy I think the expression is this one Total Work done(Due to pressure) = Total Change in Mechanical Energy(Potential Energy + Kinetic Energy) 


#2
Jan413, 10:22 AM

Mentor
P: 11,904

It depends on the signs you use.
Total energy is conserved. 


#3
Feb1813, 07:22 PM

P: 72

If mechanical energy is conserved , then you have : T1+ V1 = T2+V2
(T: kinetic energy, V: potential energy) It can be written as T2T1=V1V2=>DT=DV Thus the potential energy diminishes. The amount of change in the potential energy is the work done, which is finally converted in kinetic energy, thus increasing its value. 


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