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Grade: Upto college level

                        

Is work energy theorem valid in non inertial frames?Explain

11 years ago

Answers : (2)

askIITianexpert IITDelhi
8 Points
							

Yes,work energy theorem is valid in non-inertial frames also.Only we've to take care of the pseudo forces & work done by them(fictitious work though).For example as in dynamics problems Newton's laws are applied after taking appropriate pseudo forces in non-inertial frames so do we apply work energy theorem & count work done by these pseudo forces & their effect on energy.

While applying above theorem in centre of mass frame(non-inertial or accelerated) will not  necessisate even this.

11 years ago
Pratham Ashish
17 Points
							

yes, we can apply work energy theorm in non inertial frame provided we take into account the work done by the pseudo force also.

Take for simplicity a non inertial frame which has only transational acceleration 'α' .In this frame 2nd law will take the form

m*dv/dt = F - mα ,,,...now allpying the work energy theorm, we gat

0.5*m*(V2f - V2i ) = int(F.dr) - m *int(α.dr )


Thus in case of a non inertial force kinetic energy not only changes due to work done by material forces but also due to pseudo forces.....

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Please feel free to post as many doubts on our disucssion forum as you can. If you find any question difficult to understand - post it here and we will get you the answer and detailed solution very quickly. We are all IITians and here to help you in your IIT JEE preparation. All the best .

 

Regards,

Askiitians Experts Pratham

 IIT – Delhi

11 years ago
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