A basic question from screw jack coefficient of friction

AI Thread Summary
The discussion centers on the negative coefficient of friction observed in the lowering state of a screw jack with two pulleys. Participants seek clarification on the mechanics involved and the specific arrangement of the jack and pulleys. A request for a diagram indicates a need for visual representation to better understand the system. The conversation highlights the complexities of friction in mechanical systems, particularly in the context of screw jacks. Overall, the inquiry emphasizes the importance of clear explanations and visual aids in understanding mechanical principles.
haseeb661
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why the coefficient of friction of screw jack of two pulley is negative in lowering state?
 
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haseeb661 said:
why the coefficient of friction of screw jack of two pulley is negative in lowering state?
Can you explain the question better? I don't understand the arrangement of jack and pulleys. Can you give us a diagram?

AM
 

Thread 'Derivation of Hamilton's Principle: Questions'

I have recently been really interested in the derivation of Hamiltons Principle. On my research I found that with the term ##m \cdot \frac{d}{dt} (\frac{dr}{dt} \cdot \delta r) = 0## (1) one may derivate ##\delta \int (T - V) dt = 0## (2). The derivation itself I understood quiet good, but what I don't understand is where the equation (1) came from, because in my research it was just given and not derived from anywhere. Does anybody know where (1) comes from or why from it the...
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