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# Re: are normal reaction and tension conservative ?

How can somebody answer your question without
knowing what is meant by "it"? Where is the question
which you are trying to answer?
From: "Ludwik Kowalski" <kowalskiL@MAIL.MONTCLAIR.EDU>

I am sorry i couldn't convey myself properly.
my "it" was reference to the subject line.

Consider the case of a plank (with a block on it ) at rest on the floor.
the work done by normal reaction is zero.

Now imagine a man pushes the plank upward with an acceleration.
Now the work done by normal reaction is nonzero.

can normal reaction in the second case be considered non conservative.

A similar situation is the case of a body at the lower end of a rope being
pulled vertically upward by a man moving the upper end. could we label
tension as non conservative?

Chetan wrote:

I think it depends on what forces are causing the normal reaction and
tension(like when two masses are hanging on the opposite sides of a
pulley
then the tension in th rope is due to gravity which is a conservative
force
and so the tension is conservative).

Is this right?
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