A basic question from screw jack coefficient of friction

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why the coefficient of friction of screw jack of two pulley is negative in lowering state?
 

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Andrew Mason
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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
 

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