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Work Energy Theorem

by spectrum123
Tags: energy, theorem, work
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spectrum123
#1
Jan4-13, 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)
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mfb
#2
Jan4-13, 10:22 AM
Mentor
P: 11,589
It depends on the signs you use.
Total energy is conserved.
e.chaniotakis
#3
Feb18-13, 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 T2-T1=V1-V2=>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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