Register to reply 
Work Energy Theorem 
Share this thread: 
#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: 11,576

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. 


Register to reply 
Related Discussions  
Gravitational Potential Energy and Work Energy Theorem  Introductory Physics Homework  3  
Work Energy Theorem with Kinetic Friction and External Work  Introductory Physics Homework  7  
WorkEnergy Theorem question with not much detail to work with...  Introductory Physics Homework  18  
WorkEnergy theorem and kinetic energy pertaining to a car  Introductory Physics Homework  4  
Model AirplaneWorkEnergy Theorem and Kinetic Energy  Introductory Physics Homework  2 