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ikjadoon
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Homework Statement
Work done by conservative forces = -[tex]\Delta[/tex]U
Homework Equations
Above.
The Attempt at a Solution
Here is the whole equation:
Wc+ Wnc = [tex]\Delta[/tex]K.
Wnc = [tex]\Delta[/tex]K + [tex]\Delta[/tex]U.
So, Wc = -[tex]\Delta[/tex]U.
But, for example, how does that apply in a situation with no potential energy changes, but still with work done by conservative forces?!
Example: a block slides across a horizontal, flat table and comes to rest due to friction. There was no change in gravitational or spring-related potential energy (the only two forms of potential energy I can think of). However, there was work done (50J or whatever) by friction on the block. Thus, 50J = 0J! There is no change in potential energy, but there was work done by conservative forces.
Where did I go wrong?
Thanks,
~Ibrahim~
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