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![[Post New]](/templates/default/images/icon_minipost_new.gif) 20 Nov 2007 15:40:53 IST
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Change in Kinetic energy=? A- Work done by all the forces(internal+external+conservative+non conservative) B- Work done by all the forces(internal+external+conservative) C- Work done by all internal forces(conservative+non conservative) D- Work done by all external forces(conservative+non conservative) Answer as soon as possible. URGENT!!! Rates assured.
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20 Nov 2007 15:44:14 IST
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[B] I think.
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20 Nov 2007 15:46:10 IST
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i think its A
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20 Nov 2007 15:47:17 IST
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@nishant
http://www.batesville.k12.in.us/physics/PhyNet/Mechanics/Energy/stored_energy.htm
So, answer is not [a]
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20 Nov 2007 15:53:17 IST
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Rooney ,
the link you provided does not solve my problem.
It does not tells clearly why the answer is not (A).
Even I think the answer is (A).
Somebody please help.
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The quality of a person's life is in direct proportion to their commitment to excellence, regardless of their chosen field of endeavor.
It is during our darkest moments that we must focus to see the light.
Check out my blog at:
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20 Nov 2007 15:54:20 IST
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Rooney ,
the link you provided does not solve my problem.
It does not tells clearly why the answer is not (A).
Even I think the answer is (A).
Somebody please help.
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The quality of a person's life is in direct proportion to their commitment to excellence, regardless of their chosen field of endeavor.
It is during our darkest moments that we must focus to see the light.
Check out my blog at:
http://tarinbansal.blogspot.com/
(A must see for every student)
Back to goiit, this time with Baby Veerappan. :D |
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20 Nov 2007 15:54:35 IST
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The quality of a person's life is in direct proportion to their commitment to excellence, regardless of their chosen field of endeavor.
It is during our darkest moments that we must focus to see the light.
Check out my blog at:
http://tarinbansal.blogspot.com/
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As you say when pushing a book, the work that you do "against friction" is apparently lost - it is certainly not available to the book as kinetic energy! Forces that do not store energy are called nonconservative or dissipative forces. Friction is a nonconservative force, and there are others. Any friction-type force, like air resistance, is a nonconservative force. The energy that it removes from the system is no longer available to the system for kinetic energy.
So, how is not clear that [A] is not the answer as it includes non-conservative forces
EDIT : Hmm well I thought about it. Consider you throw a block on a rough surface. So, initial kinetic energy is +ve. Friction acts on it and reduces K.E. to 0. So, there is change in K.E. So, answer could be [A]. I agree.
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20 Nov 2007 16:07:09 IST
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My question is CHANGE IN KE . For example when a block is slowly descending down an incline with friction, in that case the change in KE=0. It means that we have to consider the work done by friction also. Becoz if we consider the work done by mg only, than it would tend to increase the KE of the body. But as change in KE=0, it means that the work done by friction will aslo be considered.
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The quality of a person's life is in direct proportion to their commitment to excellence, regardless of their chosen field of endeavor.
It is during our darkest moments that we must focus to see the light.
Check out my blog at:
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(A must see for every student)
Back to goiit, this time with Baby Veerappan. :D |
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20 Nov 2007 16:08:43 IST
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It should be A
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Will nip in at times to solve problems :)
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20 Nov 2007 16:10:50 IST
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@tarin
yes, i edited the last reply
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20 Nov 2007 23:49:08 IST
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Its A only.
Rooney Let a body moving with velocity v is kept on floor with some friction. Its KE decreases. Its friction which is doing negative work on it.
In your example you are doing some positive work on the book while friction is doing some negative work on the book. If your fore is equal to frictional force then total work done on book is zero and hence there is no change in KE
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Krishna Gopal Singh
B.Tech Chemical Engg
IIT Delhi 2002
Currently doing PhD from IIT Delhi |
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20 Nov 2007 23:59:19 IST
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it will be d
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21 Nov 2007 14:10:39 IST
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its (b) only conservative forces are taken into account
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21 Nov 2007 15:53:15 IST
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