# frictional workdone

how to calculate workdone by friction for one cyclic process.
does this work done does not depends on the internal energy of the system

62
Lokesh Verma ·

work done is force into displacement.

I dont know what context you are asking in.. but to me this is the best reason!

3
msp ·

nishant sir due to frictional force some part of the energy of the system is dissipated through sound or heat, due to this some part of the internal energy of the system is decreased how to account for the workdone. please reply me sir.

62
Lokesh Verma ·

in mechanics we dont consider the internal energy until specified!.. (if u are talking about the internal energy of the heat chapter!)

If it is something else then i did not understand your question still1 :(

3
msp ·

sir the frictional force is a non conservative force so how to calculate the work done due to the force

1
skygirl ·

take small displacements dx ... calculate dW=F.dx for the whole path...
(not sure about ur doubt but i think this cud help.. can u post a problem on your doubt ?.. then it will be esaier... )

33
Abhishek Priyam ·

ohh....

Dear, work done is defined for any force conservative or non conservative... its s imply w=âˆ«F.dx
no matter what the force is...

For defining potential energy you need the force to be conservative...

I think he is confused by the question of pure rolling in which he might have been asked to find work done by frictional force...

1
skygirl ·

haan this is wat i told... it is F.dx .. never mind wat F is..