Thank you for your reply. This is not a homework. I'm studying the conservation of energy in escleronomic systems subjected to conservative forces. All the books I've read only said that in such cases we have "-dV = dU", but they don't give any explanation about it. Searching a little bit, I saw...
Could anyone help me with the following questions?
- Why is the work done by conservative forces equivalent to the potential energy?
- Why is the variation of the potential energy in such cases equals to the variation of the work function?
Thanks!